TODO for now #2

[m-luk]

• [x] Add option to go back to main menu to the crash screen
• [x] Add scoring and score display
• [x] Rethink runloop and sub-loops execution
• [ ] Rethink ui.py text placing (mainly allow to centralize text)
• [ ] credits and leaderboard
• [ ] some barriers?

[m-luk]

as of 8c0dcf7f7d7a0c4f20bb887cb27c3d68775b45d6 score display works

[m-luk]

as of 89139213927b0880b02b082c71a9c4d0119b854e runloop changed for code readability, however menu performance dropped, new issue for that