Allow Reverting to a specific Frame in TAS Mode

[oberien]

Allow the user to revert / rewind / go back to a specific frame in their recording. This can be used as savestates-lite in the beginning and allows repeating / improving certain parts of the run.

Regarding the UI:

Dat Boi in Discord asked this:

would it be possible to add a bind that goes backwards a frame, the opposite of frame advance so i dont have to meticulously play back the tas frame by frame seeing what i did wrong

Yep, but to an extent. After a few more messages, they suggested this:

i think there should be 2 binds for rewinding, one has an input box where you can specify how many frames to go back, itll then go to a new game and speed up to the frame indicated, and the other simply rewinds player positions by a frame mode1 would be for buttons and mode 2 for general movement