Move severity menu items to a sub menu
Move severity menu items to a sub menu

This commit moves the menu items to change a diagnostic's severity
(Error, Warning, Info, etc.) off of the context menu and into a sub menu
under "Set Rule Set Severity". This reduces clutter and makes it clearer
what is going to be changed by selecting one of these.

tsdl2013/roslyn,ljw1004/roslyn,Pvlerick/roslyn,jcouv/roslyn,moozzyk/roslyn,garryforreg/roslyn,panopticoncentral/roslyn,leppie/roslyn,TyOverby/roslyn,pjmagee/roslyn,MatthieuMEZIL/roslyn,genlu/roslyn,RipCurrent/roslyn,natgla/roslyn,jeremymeng/roslyn,CyrusNajmabadi/roslyn,wvdd007/roslyn,DustinCampbell/roslyn,danielcweber/roslyn,dpoeschl/roslyn,pdelvo/roslyn,rgani/roslyn,VPashkov/roslyn,VPashkov/roslyn,jasonmalinowski/roslyn,xoofx/roslyn,Inverness/roslyn,AlekseyTs/roslyn,russpowers/roslyn,eriawan/roslyn,drognanar/roslyn,marksantos/roslyn,VSadov/roslyn,wschae/roslyn,panopticoncentral/roslyn,moozzyk/roslyn,rchande/roslyn,shyamnamboodiripad/roslyn,1234-/roslyn,davkean/roslyn,VPashkov/roslyn,dpoeschl/roslyn,ljw1004/roslyn,dovzhikova/roslyn,kienct89/roslyn,pdelvo/roslyn,devharis/roslyn,paulvanbrenk/roslyn,ericfe-ms/roslyn,robinsedlaczek/roslyn,agocke/roslyn,KirillOsenkov/roslyn,zooba/roslyn,KevinH-MS/roslyn,yjfxfjch/roslyn,KashishArora/Roslyn,basoundr/roslyn,dotnet/roslyn,cston/roslyn,mmitche/roslyn,xoofx/roslyn,vcsjones/roslyn,jonatassaraiva/roslyn,oberxon/roslyn,AArnott/roslyn,KashishArora/Roslyn,BugraC/roslyn,mirhagk/roslyn,stephentoub/roslyn,tsdl2013/roslyn,zooba/roslyn,jmarolf/roslyn,sharadagrawal/Roslyn,abock/roslyn,Giftednewt/roslyn,abock/roslyn,managed-commons/roslyn,sharwell/roslyn,wschae/roslyn,amcasey/roslyn,GuilhermeSa/roslyn,lorcanmooney/roslyn,Shiney/roslyn,DanielRosenwasser/roslyn,REALTOBIZ/roslyn,zooba/roslyn,wvdd007/roslyn,poizan42/roslyn,enginekit/roslyn,nemec/roslyn,cston/roslyn,ilyes14/roslyn,jaredpar/roslyn,agocke/roslyn,KiloBravoLima/roslyn,oocx/roslyn,amcasey/roslyn,jamesqo/roslyn,CaptainHayashi/roslyn,FICTURE7/roslyn,OmniSharp/roslyn,mseamari/Stuff,jcouv/roslyn,antonssonj/roslyn,dovzhikova/roslyn,KashishArora/Roslyn,danielcweber/roslyn,reaction1989/roslyn,khyperia/roslyn,ErikSchierboom/roslyn,gafter/roslyn,RipCurrent/roslyn,akrisiun/roslyn,weltkante/roslyn,ErikSchierboom/roslyn,jhendrixMSFT/roslyn,zmaruo/roslyn,a-ctor/roslyn,AlexisArce/roslyn,KevinRansom/roslyn,mgoertz-msft/roslyn,a-ctor/roslyn,3F/roslyn,AlekseyTs/roslyn,CaptainHayashi/roslyn,JakeGinnivan/roslyn,thomaslevesque/roslyn,jroggeman/roslyn,abock/roslyn,rgani/roslyn,stebet/roslyn,thomaslevesque/roslyn,tang7526/roslyn,1234-/roslyn,ahmedshuhel/roslyn,FICTURE7/roslyn,KamalRathnayake/roslyn,VitalyTVA/roslyn,antiufo/roslyn,AArnott/roslyn,dpen2000/roslyn,jcouv/roslyn,hanu412/roslyn,Inverness/roslyn,nguerrera/roslyn,evilc0des/roslyn,lisong521/roslyn,Shiney/roslyn,devharis/roslyn,bartdesmet/roslyn,mattwar/roslyn,natgla/roslyn,v-codeel/roslyn,drognanar/roslyn,mseamari/Stuff,magicbing/roslyn,oberxon/roslyn,leppie/roslyn,jeffanders/roslyn,KevinRansom/roslyn,Giten2004/roslyn,AdamSpeight2008/roslyn-AdamSpeight2008,EricArndt/roslyn,sharadagrawal/Roslyn,AnthonyDGreen/roslyn,stebet/roslyn,jbhensley/roslyn,lisong521/roslyn,jroggeman/roslyn,Giftednewt/roslyn,khyperia/roslyn,antonssonj/roslyn,mmitche/roslyn,Hosch250/roslyn,AnthonyDGreen/roslyn,srivatsn/roslyn,stephentoub/roslyn,reaction1989/roslyn,jramsay/roslyn,brettfo/roslyn,jmarolf/roslyn,KevinRansom/roslyn,huoxudong125/roslyn,yeaicc/roslyn,genlu/roslyn,FICTURE7/roslyn,orthoxerox/roslyn,drognanar/roslyn,VShangxiao/roslyn,stephentoub/roslyn,dotnet/roslyn,jrharmon/roslyn,enginekit/roslyn,rchande/roslyn,VSadov/roslyn,nagyistoce/roslyn,bbarry/roslyn,antonssonj/roslyn,CyrusNajmabadi/roslyn,mgoertz-msft/roslyn,eriawan/roslyn,cybernet14/roslyn,mattscheffer/roslyn,khyperia/roslyn,VitalyTVA/roslyn,kelltrick/roslyn,natidea/roslyn,jgglg/roslyn,srivatsn/roslyn,cybernet14/roslyn,wschae/roslyn,krishnarajbb/roslyn,dsplaisted/roslyn,mavasani/roslyn,huoxudong125/roslyn,CaptainHayashi/roslyn,devharis/roslyn,akoeplinger/roslyn,physhi/roslyn,aanshibudhiraja/Roslyn,shyamnamboodiripad/roslyn,russpowers/roslyn,dpen2000/roslyn,Giten2004/roslyn,EricArndt/roslyn,ValentinRueda/roslyn,tang7526/roslyn,MihaMarkic/roslyn-prank,dpen2000/roslyn,basoundr/roslyn,srivatsn/roslyn,davkean/roslyn,rgani/roslyn,xasx/roslyn,tmat/roslyn,sharwell/roslyn,jbhensley/roslyn,Hosch250/roslyn,AArnott/roslyn,ericfe-ms/roslyn,jaredpar/roslyn,DinoV/roslyn,droyad/roslyn,swaroop-sridhar/roslyn,diryboy/roslyn,garryforreg/roslyn,aelij/roslyn,Maxwe11/roslyn,mavasani/roslyn,YOTOV-LIMITED/roslyn,mmitche/roslyn,diryboy/roslyn,genlu/roslyn,heejaechang/roslyn,ahmedshuhel/roslyn,physhi/roslyn,tang7526/roslyn,DinoV/roslyn,nemec/roslyn,a-ctor/roslyn,antiufo/roslyn,tvand7093/roslyn,supriyantomaftuh/roslyn,kuhlenh/roslyn,marksantos/roslyn,mavasani/roslyn,MichalStrehovsky/roslyn,poizan42/roslyn,managed-commons/roslyn,VShangxiao/roslyn,AmadeusW/roslyn,AnthonyDGreen/roslyn,balajikris/roslyn,jbhensley/roslyn,tmeschter/roslyn,eriawan/roslyn,mgoertz-msft/roslyn,grianggrai/roslyn,DanielRosenwasser/roslyn,KevinH-MS/roslyn,oocx/roslyn,nagyistoce/roslyn,DustinCampbell/roslyn,jkotas/roslyn,bartdesmet/roslyn,lorcanmooney/roslyn,REALTOBIZ/roslyn,nagyistoce/roslyn,furesoft/roslyn,kienct89/roslyn,3F/roslyn,ilyes14/roslyn,paladique/roslyn,mattwar/roslyn,tsdl2013/roslyn,SeriaWei/roslyn,droyad/roslyn,OmniSharp/roslyn,moozzyk/roslyn,jonatassaraiva/roslyn,tmat/roslyn,oberxon/roslyn,robinsedlaczek/roslyn,MichalStrehovsky/roslyn,OmarTawfik/roslyn,chenxizhang/roslyn,stjeong/roslyn,Pvlerick/roslyn,cybernet14/roslyn,ahmedshuhel/roslyn,zmaruo/roslyn,doconnell565/roslyn,tmat/roslyn,VitalyTVA/roslyn,sharadagrawal/TestProject2,pdelvo/roslyn,jroggeman/roslyn,budcribar/roslyn,stjeong/roslyn,balajikris/roslyn,MattWindsor91/roslyn,KevinH-MS/roslyn,jhendrixMSFT/roslyn,stebet/roslyn,mattwar/roslyn,OmarTawfik/roslyn,krishnarajbb/roslyn,Hosch250/roslyn,khellang/roslyn,tannergooding/roslyn,TyOverby/roslyn,jrharmon/roslyn,supriyantomaftuh/roslyn,MattWindsor91/roslyn,jamesqo/roslyn,doconnell565/roslyn,davkean/roslyn,swaroop-sridhar/roslyn,jramsay/roslyn,krishnarajbb/roslyn,physhi/roslyn,shyamnamboodiripad/roslyn,stjeong/roslyn,tannergooding/roslyn,yeaicc/roslyn,jramsay/roslyn,evilc0des/roslyn,furesoft/roslyn,v-codeel/roslyn,nguerrera/roslyn,KiloBravoLima/roslyn,ericfe-ms/roslyn,poizan42/roslyn,akrisiun/roslyn,OmniSharp/roslyn,HellBrick/roslyn,HellBrick/roslyn,jasonmalinowski/roslyn,lisong521/roslyn,YOTOV-LIMITED/roslyn,jeremymeng/roslyn,dpoeschl/roslyn,khellang/roslyn,managed-commons/roslyn,heejaechang/roslyn,nemec/roslyn,Maxwe11/roslyn,akrisiun/roslyn,AmadeusW/roslyn,akoeplinger/roslyn,Maxwe11/roslyn,ErikSchierboom/roslyn,KamalRathnayake/roslyn,MavenRain/roslyn,gafter/roslyn,vcsjones/roslyn,CyrusNajmabadi/roslyn,bartdesmet/roslyn,grianggrai/roslyn,thomaslevesque/roslyn,russpowers/roslyn,KiloBravoLima/roslyn,garryforreg/roslyn,gafter/roslyn,MavenRain/roslyn,michalhosala/roslyn,diryboy/roslyn,MihaMarkic/roslyn-prank,Giftednewt/roslyn,marksantos/roslyn,bkoelman/roslyn,hanu412/roslyn,vcsjones/roslyn,aanshibudhiraja/Roslyn,bkoelman/roslyn,sharadagrawal/Roslyn,xasx/roslyn,jasonmalinowski/roslyn,DinoV/roslyn,tmeschter/roslyn,michalhosala/roslyn,bbarry/roslyn,Pvlerick/roslyn,yjfxfjch/roslyn,kelltrick/roslyn,natidea/roslyn,ValentinRueda/roslyn,jhendrixMSFT/roslyn,mattscheffer/roslyn,vslsnap/roslyn,agocke/roslyn,pjmagee/roslyn,doconnell565/roslyn,weltkante/roslyn,grianggrai/roslyn,AlexisArce/roslyn,taylorjonl/roslyn,mattscheffer/roslyn,khellang/roslyn,jkotas/roslyn,natidea/roslyn,balajikris/roslyn,paladique/roslyn,panopticoncentral/roslyn,vslsnap/roslyn,jeffanders/roslyn,weltkante/roslyn,3F/roslyn,akoeplinger/roslyn,dsplaisted/roslyn,hanu412/roslyn,jmarolf/roslyn,MavenRain/roslyn,rchande/roslyn,MichalStrehovsky/roslyn,cston/roslyn,SeriaWei/roslyn,v-codeel/roslyn,budcribar/roslyn,aelij/roslyn,brettfo/roslyn,BugraC/roslyn,VShangxiao/roslyn,magicbing/roslyn,evilc0des/roslyn,vslsnap/roslyn,orthoxerox/roslyn,jgglg/roslyn,danielcweber/roslyn,JakeGinnivan/roslyn,jgglg/roslyn,KirillOsenkov/roslyn,michalhosala/roslyn,furesoft/roslyn,AdamSpeight2008/roslyn-AdamSpeight2008,chenxizhang/roslyn,bkoelman/roslyn,paulvanbrenk/roslyn,MattWindsor91/roslyn,yeaicc/roslyn,OmarTawfik/roslyn,GuilhermeSa/roslyn,jamesqo/roslyn,Giten2004/roslyn,YOTOV-LIMITED/roslyn,leppie/roslyn,reaction1989/roslyn,oocx/roslyn,wvdd007/roslyn,tannergooding/roslyn,chenxizhang/roslyn,SeriaWei/roslyn,taylorjonl/roslyn,MihaMarkic/roslyn-prank,KamalRathnayake/roslyn,BugraC/roslyn,Inverness/roslyn,huoxudong125/roslyn,AlexisArce/roslyn,DustinCampbell/roslyn,enginekit/roslyn,heejaechang/roslyn,budcribar/roslyn,droyad/roslyn,paladique/roslyn,MatthieuMEZIL/roslyn,mirhagk/roslyn,aanshibudhiraja/Roslyn,kienct89/roslyn,RipCurrent/roslyn,kelltrick/roslyn,antiufo/roslyn,EricArndt/roslyn,GuilhermeSa/roslyn,Shiney/roslyn,supriyantomaftuh/roslyn,AlekseyTs/roslyn,TyOverby/roslyn,VSadov/roslyn,mirhagk/roslyn,magicbing/roslyn,DanielRosenwasser/roslyn,AdamSpeight2008/roslyn-AdamSpeight2008,amcasey/roslyn,KirillOsenkov/roslyn,jkotas/roslyn,paulvanbrenk/roslyn,natgla/roslyn,1234-/roslyn,robinsedlaczek/roslyn,swaroop-sridhar/roslyn,ilyes14/roslyn,dotnet/roslyn,sharadagrawal/TestProject2,lorcanmooney/roslyn,orthoxerox/roslyn,dovzhikova/roslyn,AmadeusW/roslyn,pjmagee/roslyn,tvand7093/roslyn,yjfxfjch/roslyn,tvand7093/roslyn,bbarry/roslyn,MatthieuMEZIL/roslyn,xoofx/roslyn,jeremymeng/roslyn,basoundr/roslyn,jrharmon/roslyn,sharadagrawal/TestProject2,kuhlenh/roslyn,kuhlenh/roslyn,xasx/roslyn,HellBrick/roslyn,ValentinRueda/roslyn,JakeGinnivan/roslyn,tmeschter/roslyn,zmaruo/roslyn,jaredpar/roslyn,brettfo/roslyn,MattWindsor91/roslyn,mseamari/Stuff,REALTOBIZ/roslyn,dsplaisted/roslyn,nguerrera/roslyn,taylorjonl/roslyn,jeffanders/roslyn,ljw1004/roslyn,jonatassaraiva/roslyn,aelij/roslyn,sharwell/roslyn