Update `INSTALL.md` to mention ponyup for Windows.  (#4003)
Update `INSTALL.md` to mention ponyup for Windows.  (#4003)

Also update prerequisites to reflect updated VS version and terminology.
ponylang/ponyc,dipinhora/ponyc,ponylang/ponyc,dipinhora/ponyc,jemc/ponyc,jemc/ponyc,ponylang/ponyc,jemc/ponyc,dipinhora/ponyc