Add hook for apps to register their own settings.
Add hook for apps to register their own settings.

agepoly/mezzanine,wyzex/mezzanine,adrian-the-git/mezzanine,frankchin/mezzanine,saintbird/mezzanine,eino-makitalo/mezzanine,orlenko/sfpirg,frankchin/mezzanine,douglaskastle/mezzanine,biomassives/mezzanine,wyzex/mezzanine,orlenko/plei,cccs-web/mezzanine,Kniyl/mezzanine,Kniyl/mezzanine,dekomote/mezzanine-modeltranslation-backport,jjz/mezzanine,industrydive/mezzanine,sjuxax/mezzanine,dsanders11/mezzanine,readevalprint/mezzanine,sjdines/mezzanine,industrydive/mezzanine,adrian-the-git/mezzanine,promil23/mezzanine,ryneeverett/mezzanine,SoLoHiC/mezzanine,wyzex/mezzanine,wbtuomela/mezzanine,dsanders11/mezzanine,dovydas/mezzanine,jerivas/mezzanine,batpad/mezzanine,guibernardino/mezzanine,tuxinhang1989/mezzanine,geodesign/mezzanine,damnfine/mezzanine,stephenmcd/mezzanine,molokov/mezzanine,Cicero-Zhao/mezzanine,nikolas/mezzanine,PegasusWang/mezzanine,joshcartme/mezzanine,frankier/mezzanine,theclanks/mezzanine,dustinrb/mezzanine,frankchin/mezzanine,Cajoline/mezzanine,Cicero-Zhao/mezzanine,vladir/mezzanine,Skytorn86/mezzanine,batpad/mezzanine,sjdines/mezzanine,viaregio/mezzanine,webounty/mezzanine,douglaskastle/mezzanine,dustinrb/mezzanine,Kniyl/mezzanine,joshcartme/mezzanine,christianwgd/mezzanine,webounty/mezzanine,eino-makitalo/mezzanine,fusionbox/mezzanine,stbarnabas/mezzanine,douglaskastle/mezzanine,Skytorn86/mezzanine,sjuxax/mezzanine,adrian-the-git/mezzanine,emile2016/mezzanine,jerivas/mezzanine,gradel/mezzanine,nikolas/mezzanine,joshcartme/mezzanine,wbtuomela/mezzanine,vladir/mezzanine,dekomote/mezzanine-modeltranslation-backport,ZeroXn/mezzanine,orlenko/plei,christianwgd/mezzanine,geodesign/mezzanine,spookylukey/mezzanine,gbosh/mezzanine,stephenmcd/mezzanine,guibernardino/mezzanine,ryneeverett/mezzanine,PegasusWang/mezzanine,jerivas/mezzanine,christianwgd/mezzanine,jjz/mezzanine,webounty/mezzanine,SoLoHiC/mezzanine,saintbird/mezzanine,AlexHill/mezzanine,stephenmcd/mezzanine,dustinrb/mezzanine,PegasusWang/mezzanine,wrwrwr/mezzanine,orlenko/sfpirg,agepoly/mezzanine,scarcry/snm-mezzanine,viaregio/mezzanine,biomassives/mezzanine,saintbird/mezzanine,SoLoHiC/mezzanine,biomassives/mezzanine,gbosh/mezzanine,dovydas/mezzanine,Cajoline/mezzanine,dekomote/mezzanine-modeltranslation-backport,spookylukey/mezzanine,dovydas/mezzanine,promil23/mezzanine,molokov/mezzanine,wbtuomela/mezzanine,mush42/mezzanine,emile2016/mezzanine,readevalprint/mezzanine,molokov/mezzanine,nikolas/mezzanine,sjdines/mezzanine,scarcry/snm-mezzanine,fusionbox/mezzanine,frankier/mezzanine,jjz/mezzanine,gradel/mezzanine,Skytorn86/mezzanine,gbosh/mezzanine,damnfine/mezzanine,spookylukey/mezzanine,ZeroXn/mezzanine,scarcry/snm-mezzanine,mush42/mezzanine,dsanders11/mezzanine,stbarnabas/mezzanine,readevalprint/mezzanine,promil23/mezzanine,theclanks/mezzanine,viaregio/mezzanine,eino-makitalo/mezzanine,wrwrwr/mezzanine,tuxinhang1989/mezzanine,industrydive/mezzanine,mush42/mezzanine,emile2016/mezzanine,Cajoline/mezzanine,damnfine/mezzanine,orlenko/plei,ZeroXn/mezzanine,sjuxax/mezzanine,geodesign/mezzanine,vladir/mezzanine,cccs-web/mezzanine,theclanks/mezzanine,agepoly/mezzanine,ryneeverett/mezzanine,gradel/mezzanine,frankier/mezzanine,orlenko/sfpirg,AlexHill/mezzanine,tuxinhang1989/mezzanine