1. Ensures that monoids are registered correctly
2. Type checks on effect changes
3. Consistent use of object-oriented functions (':_get_player_data', ...)
4. 'branch:delete(...)' now also returns 'true' on success
The code still has inconsistent variable naming in several places, which
should be addressed later for easier understanding.
This commit enhances the player_monoids library by adding branching support and an improved testing system to make sure it works, as proposed in #9 . These changes enable isolated player state management and improve library reliability. This PR focuses on implementing the branching proposal and adding automated tests.
