Add cheats from ATX mod

[meekee7]

ATX V2.13 lists 41 cheats / console commands that were added or had their behavior modified. When sensible or applicable, those cheats should be supported by OTP as well.

One cheat, an FPS indicator, has already been implemented (see issue #24).
I suggest not reimplementing the REC cheat for screen recording. There is plenty of screen recording software and even Windows 10 itself supports that feature via the Xbox Game Bar.