install repair mode

[ThePotatoGuy]

the installer could also function as a repair existing install (like other installers in the wild).

Some immediate features:

• [x] delete rpys and rpycs
• [ ] delete pycs
• [ ] delete the update/ folder from game/
• [ ] new files (.rpyc.new after failed updated)
• [ ] delete other files that we know are bad
• [ ] on macs, remove libs - or whatever that wont let it run
• [ ] on macs, do folder restructure
• [ ] steam install to itch io install conversion