Add a version check that stops you from booting a save on incompatible romfs != game versions

[Miepee]

If a 2.1.0 romfs was used to export the game, but the player is playing on 1.0.0 (or vice versa) the game should not let you start any save

[MayberryZoom]

Is this actually necessary? I know if you use 1.0.0 for 2.1.0 there's broken text strings, but the game is totally playable. Does anything break badly if you use 2.1.0 for 1.0.0?

[Miepee]

IIRC there was something that broke badly, @steven11sjf might remember.