MosaicMC 0.0.7-alpha for Minecraft 1.20.1

• Removed Subscriber functional interface
• Removed depracted codecs
• Renamed SubscriberObject to Subscriber
• Renamed ListenerBuilder to Listener
• Moved some functions outside of classes
• Fixed "unsafe" casts in some code.
• Removed internal vars

Full Changelog: https://github.com/MosaicMC/MosaicCore/compare/a0.0.6...a0.0.7