Extra mode data in replays

[Not-A-Normal-Robot]

What feature do you want to suggest to the game?

Maybe a way to save some custom values into a replay (e.g. bot inputs, custom game state) so our replay system can support battle and custom game modes?

Maybe we could have it be in P.repData or something like that. idk if that's already taken by another var tho.
We'd also probably need to handle replay versioning because this would probably significantly change the replay format.

Maybe have the replay start with its version, and to ensure compatibility with old replays, all new replays should start with the string "TNRSv1:" (Techmino New Replay System) so it should be easy to distinguish. The prefix should also end with a non-numeric char so "TNRSv10:" could be detected as the 11th replay system.