Add Verilog/SystemVerilog filename extensions
Add Verilog/SystemVerilog filename extensions

Most Verilog files use the *.vh extension for header files.

Since the IEEE 1800-2009 SystemVerilog standard, it is common for
hardware and verification files written using the newer language
constructs to use the *.sv extension for design elements, and *.svh for
headers.

tschf/linguist,steventhanna/linguist,FStarLang/linguist,R4PaSs/linguist,0a-/linguist,phpsgi/linguist,ilyes14/linguist,georgesuperman/linguist,scttnlsn/linguist,a0viedo/linguist,davidzchen/linguist,douglas-larocca/linguist,whitj00/linguist,jrnold/linguist,github/linguist,marcojonker/test,MahmoudFayed/linguist,kyoungrok0517/linguist,ya7lelkom/linguist,martynbm/linguist,MahmoudFayed/linguist,nburkley/linguist,sebgod/linguist,sagar290/linguist,CoderXpert/linguist,CoderXpert/linguist,pcantrell/linguist,nburkley/linguist,PsichiX/linguist,ChaiScript/linguist,gitlabhq/linguist,hcutler/linguist,Rockyspade/linguist,phpsgi/linguist,MostAwesomeDude/linguist,yyx990803/linguist,stanhu/linguist,kr/linguist,chiranjeevjain/linguist,github/linguist,erkyrath/linguist,marcojonker/test,assimovt/ling-ist,yyx990803/linguist,davidzchen/linguist,seanders/linguist,JJ/linguist,CegepVictoriaville/linguist,MadcapJake/linguist,pchaigno/linguist,alvarotrigo/linguist,assimovt/ling-ist,maxogden/linguist,c-lipka/linguist,BerkeleyTrue/linguist,martynbm/linguist,osorgin/linguist,JJ/linguist,sagar290/linguist,iblech/linguist,sideci-sample/sideci-sample-linguist,christop/linguist,iblech/linguist,jtbandes/linguist,matt40k/linguist,manveru/linguist,BerkeleyTrue/linguist,cybernet14/linguist,alvarotrigo/linguist,mattn/linguist,meunierfrederic/octocatlinguist,sebgod/linguist,erkyrath/linguist,whitj00/linguist,Rockyspade/linguist,SRI-CSL/linguist,meunierfrederic/octocatlinguist,seanders/linguist,kyoungrok0517/linguist,cokeboL/linguist,yscho/linguist,stanhu/linguist,CegepVictoriaville/linguist,mwpastore/linguist,cybernet14/linguist,osorgin/linguist,georgesuperman/linguist,jrnold/linguist,chiranjeevjain/linguist,ppaulweber/github-linguist,Mx7f/linguist,ammaraskar/linguist,douglas-larocca/linguist,hcutler/linguist,jtbandes/linguist,0a-/linguist,SRI-CSL/linguist,hcatlin/linguist,wcandillon/linguist,ilyes14/linguist,matt40k/linguist,adamkaplan/linguist,jjatria/linguist,yyx990803/linguist,anhongyue/test222,ammaraskar/linguist,mcandre/linguist,bluebear94/linguist,yyx990803/linguist,JJ/linguist,R4PaSs/linguist,yscho/linguist,github/linguist,manveru/linguist,blakeembrey/linguist,pchaigno/linguist,Mx7f/linguist,blakeembrey/linguist,alitalia/linguist,pchaigno/linguist,JJ/linguist,PsichiX/linguist,github/linguist,pchaigno/linguist,cokeboL/linguist,christop/linguist,Ocramius/linguist,steventhanna/linguist,stanhu/linguist,MadcapJake/linguist,alitalia/linguist,erkyrath/linguist,thejameskyle/linguist,ya7lelkom/linguist,bluebear94/linguist,stanhu/linguist,meunierfrederic/octocatlinguist,Mailaender/linguist,igat259/linguist,mattn/linguist,anhongyue/test222,thejameskyle/linguist,a0viedo/linguist,sideci-sample/sideci-sample-linguist,erkyrath/linguist,ppaulweber/github-linguist,sebgod/linguist,kr/linguist,FStarLang/linguist,scttnlsn/linguist,mwpastore/linguist,mcandre/linguist,sebgod/linguist,pcantrell/linguist,hcatlin/linguist,tschf/linguist,MostAwesomeDude/linguist,wcandillon/linguist,jjatria/linguist,c-lipka/linguist,adamkaplan/linguist