Rule functions recursion

[nicopop]

I got inspired by the problem someone had on discord because of the fact we only ran functions once and at the time said it would be complicated to fix it...
So here's a PR adding recursion to the requires's function finding and executing.
I included a maximum recursion depth param that can be changed (currently set to 5)

[nicopop]

was tested using these:

# You can also return a string from your function, and it will be evaluated as a requires string.
def recursionTest(world: World, multiworld: MultiWorld, state: CollectionState, player: int):
    """Returns a requires string that checks if the player has unlocked the tank."""
    return "{hello()}"
def recursionFail(world: World, multiworld: MultiWorld, state: CollectionState, player: int):
    """Returns a requires string that checks if the player has unlocked the tank."""
    return "{recursionFail()}"
def hello(world: World, multiworld: MultiWorld, state: CollectionState, player: int):
    return True

[FuzzyGamesOn]

Minor change