Refactor event and expression registrations to use new syntax registry system to skript 2.15 also nexo 1.23

• Updated EvtNoteBlockInteractEvent, EvtNoteBlockPlaceEvent, EvtPackUploadEvent, EvtPostPackGenerateEvent, EvtPrePackGenerateEvent, EvtStringBlockBreakEvent, EvtStringBlockDamageEvent, EvtStringBlockInteractEvent, EvtStringBlockPlaceEvent to register events using the new SyntaxRegistry and EventValueRegistry.
  
  
• Refactored expressions ExprCreateMechanic, ExprGetCustomBlockID, ExprGetCustomItem, ExprGetCustomItemID, ExprGetCustomItemIDFromProjectile, and ExprMechanicProperty to utilize the new registration method.
  
  
• Removed deprecated Skript.registerEvent and EventValues.registerEventValue calls in favor of the new syntax registration approach.