Update README.md
Fix NPE for maps without configured start regions
Cleanup packing/unpacking code a bit
Sync lobby world changes back to the config file
Attempt to remove entities from the world after a short delay

To prevent conflicts between gamemode/spawning changes
causing mobs to despawn and actually killing the entities.
Add library for playing midi tracks for players
Minor improvements to util.midi
Fix some floating issues in the match stats. Thanks @Coestar
Fix logic for practice mode
Prevent the same map from being downloaded multiple times
Save world configuration on world unload or plugin disable
Clean up victory monument calculations
Allow match info books to be optional (add config option later)
Check if match is ready to start AFTER players are added
Fix setting flight with gamemode