Support static not in the site's static folder
Support static not in the site's static folder

This is useful to give the user the option (in plugins) to shadow
existing static files with other static files.

andyzsf/Cactus-,PegasusWang/Cactus,dreadatour/Cactus,eudicots/Cactus,koobs/Cactus,fjxhkj/Cactus,fjxhkj/Cactus,Knownly/Cactus,gone/Cactus,eudicots/Cactus,koobs/Cactus,koenbok/Cactus,ibarria0/Cactus,fjxhkj/Cactus,gone/Cactus,gone/Cactus,chaudum/Cactus,koobs/Cactus,juvham/Cactus,eudicots/Cactus,PegasusWang/Cactus,Bluetide/Cactus,Bluetide/Cactus,juvham/Cactus,page-io/Cactus,danielmorosan/Cactus,juvham/Cactus,danielmorosan/Cactus,Knownly/Cactus,andyzsf/Cactus-,PegasusWang/Cactus,koenbok/Cactus,koenbok/Cactus,Bluetide/Cactus,andyzsf/Cactus-,danielmorosan/Cactus,chaudum/Cactus,chaudum/Cactus,page-io/Cactus,Knownly/Cactus,dreadatour/Cactus,dreadatour/Cactus,page-io/Cactus,ibarria0/Cactus,ibarria0/Cactus