Windows: re-organise toolchain cache (NFC)
Windows: re-organise toolchain cache (NFC)

Make a few more options more explicit and re-group a few options. This
is merely for ease of human processing.

roambotics/swift,glessard/swift,apple/swift,tkremenek/swift,parkera/swift,rudkx/swift,xwu/swift,glessard/swift,atrick/swift,JGiola/swift,ahoppen/swift,parkera/swift,hooman/swift,JGiola/swift,JGiola/swift,hooman/swift,apple/swift,atrick/swift,xwu/swift,tkremenek/swift,gregomni/swift,rudkx/swift,JGiola/swift,benlangmuir/swift,atrick/swift,xwu/swift,gregomni/swift,parkera/swift,benlangmuir/swift,roambotics/swift,tkremenek/swift,glessard/swift,xwu/swift,xwu/swift,gregomni/swift,roambotics/swift,xwu/swift,ahoppen/swift,benlangmuir/swift,glessard/swift,ahoppen/swift,gregomni/swift,parkera/swift,hooman/swift,apple/swift,parkera/swift,glessard/swift,tkremenek/swift,parkera/swift,ahoppen/swift,JGiola/swift,glessard/swift,rudkx/swift,hooman/swift,gregomni/swift,tkremenek/swift,ahoppen/swift,rudkx/swift,hooman/swift,rudkx/swift,benlangmuir/swift,apple/swift,roambotics/swift,hooman/swift,atrick/swift,xwu/swift,hooman/swift,tkremenek/swift,parkera/swift,roambotics/swift,apple/swift,roambotics/swift,tkremenek/swift,apple/swift,benlangmuir/swift,gregomni/swift,ahoppen/swift,atrick/swift,rudkx/swift,atrick/swift,benlangmuir/swift,parkera/swift,JGiola/swift