Load the Vomnibar (and all UIComponents) in a shadow DOM
Load the Vomnibar (and all UIComponents) in a shadow DOM

This insulates them from page CSS, so we don't have to compete to style
elements correctly.

Lw-Cui/vimium,PickRelated/vimium,douglas-larocca/vimium,gdh1995/vimium,bkudria/vimium,poacher2k/vimium,borgified/vimium,zhangmin510/vimium,mrmr1993/vimium,zhangmin510/vimium,Robinson10240/vimium,mrmr1993/vimium,Robinson10240/vimium,willsALMANJ/vimium,douglas-larocca/vimium,borgified/vimium,tuchangwei/vimium,Aleroniponi/vimium,willsALMANJ/vimium,hhsue/vimium,smblott-github/vimium,zhangmin510/vimium,poacher2k/vimium,csmalin/vimium,smblott-github/vimium,wildeyes/vimium,Lw-Cui/vimium,csmalin/vimium,cyrixhero/vimium,csmalin/vimium,PrestanceDesign/vimium,PickRelated/vimium,hhsue/vimium,smblott-github/vimium,wildeyes/vimium,decaffeinate-examples/vimium,philc/vimium,philc/vimium,borgified/vimium,justalittlenoob/vimium,justalittlenoob/vimium,elderbas/vimium,VPashkov/vimium,elegantwww/vimium,cyrixhero/vimium,tuchangwei/vimium,dimatter/vimium,bkudria/vimium,PrestanceDesign/vimium,Aleroniponi/vimium,elderbas/vimium,PrestanceDesign/vimium,cyrixhero/vimium,Lw-Cui/vimium,dimatter/vimium,gdh1995/vimium,hhsue/vimium,wildeyes/vimium,dimatter/vimium,PickRelated/vimium,VPashkov/vimium,gdh1995/vimium,douglas-larocca/vimium,Aleroniponi/vimium,willsALMANJ/vimium,philc/vimium,decaffeinate-examples/vimium,Robinson10240/vimium,poacher2k/vimium,tuchangwei/vimium,decaffeinate-examples/vimium,elegantwww/vimium,bkudria/vimium,elegantwww/vimium,elderbas/vimium,mrmr1993/vimium,justalittlenoob/vimium,VPashkov/vimium