godot 4.0 migration

[rafaelcastrocouto]

• [x] migrate with built in converter
• [x] rename methods
• [x] fix on ready errors
• [x] fix map load errors
• [ ] fix input errors
• [ ] fix process errors
• [x] fix ui

[bpodrygajlo]

I can do this one. I'll ask on discord if its okay to start, since everyone has to switch