Add support for other engines

[MTFT-Games]

Add guides to get engines at least kinda working that don't have a library yet.

• Rpgmaker
• Unity
• Unreal
• Pygame

[MTFT-Games]

@IgorPolotai once you get your unity game running, you should write down anything useful to someone else doing the same in a guide format! I can help with parts if needed.

[aln730]

did we ever get this done? i don't think so