Redo color vars
Redo color vars

This pulls in some changes from #18462 to include a set of generic color variables. It doesn't include a Sass map for generating the theme colors yet, since we can't easily do that for all components, but does give a few more color choices to folks and an easier way to customize.

bootstrapbrasil/bootstrap,tibo66/bootstrap,joblocal/bootstrap,Lyricalz/bootstrap,realcrowd/bootstrap,9-chirno/chirno,afuno/bootstrap,jipexu/bootstrap,sealocal/bootstrap,gijsbotje/bootstrap,tibo66/bootstrap,inway/bootstrap,fschumann1211/bootstrap,creativewebjp/bootstrap,johnajacob/bootstrap,hebbet/bootstrap,edanbarak/bootstrap,SweetProcess/bootstrap,SweetProcess/bootstrap,yuyokk/bootstrap,lemuelbarango/bootstrap,xt0rted/bootstrap,zalog/bootstrap,nice-fungal/bootstrap,bardiharborow/bootstrap,twbs/bootstrap,kvlsrg/bootstrap,TheFridayInstitute/bootstrap,tibo66/bootstrap,n054/bootstrap,supergibbs/bootstrap,janseliger/bootstrap,lipis/bootstrap,fschumann1211/bootstrap,xt0rted/bootstrap,GerHobbelt/bootstrap,Lyricalz/bootstrap,Scoutski/bootstrap,NCARB/bootstrap,davethegr8/bootstrap,supergibbs/bootstrap,n054/bootstrap,slavanga/bootstrap,igoynawamreh/bootstrap,Hemphill/bootstrap-docs,tagliala/bootstrap,sealocal/bootstrap,afuno/bootstrap,9-chirno/chirno,9-chirno/chirno,Scoutski/bootstrap,seanwu99/bootstrap,9-chirno/chirno,seanwu99/bootstrap,bootstrapbrasil/bootstrap,vsn4ik/bootstrap,peterblazejewicz/bootstrap,igoynawamreh/bootstrap,johnajacob/bootstrap,Scoutski/bootstrap,tagliala/bootstrap,janseliger/bootstrap,seanwu99/bootstrap,gijsbotje/bootstrap,afuno/bootstrap,lemuelbarango/bootstrap,fschumann1211/bootstrap,Delagen/bootstrap,janseliger/bootstrap,vsn4ik/bootstrap,tjkohli/bootstrap,johnajacob/bootstrap,igoynawamreh/bootstrap,gijsbotje/bootstrap,joblocal/bootstrap,realcrowd/bootstrap,johnajacob/bootstrap,JumpLinkNetwork/bootstrap-backward,JumpLinkNetwork/bootstrap-backward,SweetProcess/bootstrap,twbs/bootstrap,edanbarak/bootstrap,slavanga/bootstrap,copperdesign/bootstrap,lipis/bootstrap,NCARB/bootstrap,edanbarak/bootstrap,m5o/bootstrap,bardiharborow/bootstrap,hebbet/bootstrap,tibo66/bootstrap,Delagen/bootstrap,peterblazejewicz/bootstrap,NCARB/bootstrap,davethegr8/bootstrap,coliff/bootstrap,GerHobbelt/bootstrap,yuyokk/bootstrap,andresgalante/bootstrap,kvlsrg/bootstrap,Scoutski/bootstrap,TheFridayInstitute/bootstrap,supergibbs/bootstrap,edanbarak/bootstrap,NCARB/bootstrap,hebbet/bootstrap,seanwu99/bootstrap,davethegr8/bootstrap,bardiharborow/bootstrap,Hemphill/bootstrap-docs,bardiharborow/bootstrap,joblocal/bootstrap,jipexu/bootstrap,andresgalante/bootstrap,SweetProcess/bootstrap,copperdesign/bootstrap,jipexu/bootstrap,yuyokk/bootstrap,slavanga/bootstrap,nice-fungal/bootstrap,IdanCo/bootstrap,lipis/bootstrap,n054/bootstrap,TheFridayInstitute/bootstrap,lipis/bootstrap,JumpLinkNetwork/bootstrap-backward,lemuelbarango/bootstrap,inway/bootstrap,lemuelbarango/bootstrap,Hemphill/bootstrap-docs,copperdesign/bootstrap,janseliger/bootstrap,realcrowd/bootstrap,IdanCo/bootstrap,tjkohli/bootstrap,igoynawamreh/bootstrap,bootstrapbrasil/bootstrap,GerHobbelt/bootstrap,stanwmusic/bootstrap,peterblazejewicz/bootstrap,n054/bootstrap,supergibbs/bootstrap,vsn4ik/bootstrap,zalog/bootstrap,yuyokk/bootstrap,inway/bootstrap,IdanCo/bootstrap,creativewebjp/bootstrap,vsn4ik/bootstrap,tagliala/bootstrap,IdanCo/bootstrap,slavanga/bootstrap,xt0rted/bootstrap,Delagen/bootstrap,andresgalante/bootstrap,stanwmusic/bootstrap,copperdesign/bootstrap,hebbet/bootstrap,davethegr8/bootstrap,stanwmusic/bootstrap,sealocal/bootstrap,jipexu/bootstrap,sealocal/bootstrap,m5o/bootstrap,stanwmusic/bootstrap,Hemphill/bootstrap-docs,creativewebjp/bootstrap,andresgalante/bootstrap,xt0rted/bootstrap,nice-fungal/bootstrap,realcrowd/bootstrap,JumpLinkNetwork/bootstrap-backward,Delagen/bootstrap,kvlsrg/bootstrap,TheFridayInstitute/bootstrap,fschumann1211/bootstrap,joblocal/bootstrap,zalog/bootstrap,afuno/bootstrap,gijsbotje/bootstrap,Lyricalz/bootstrap,creativewebjp/bootstrap,Lyricalz/bootstrap,coliff/bootstrap