Predicator

Proper 1.21 port

• codecification
• removed outdated mixins
• added various missing slots (mob inventory for villagers/pillagers/piglins, and mob armor)
• added predicator:nearest_entity alternate entity condition type
• added predicator:at_destination condition type for executing a sub-term with a context's destination as origin (swapping origin and destination), if such destination is provided by the context
• added on_player_enter_portal world-tags action
  • replaces old on_player_move_to_world action, which was only executed after destination resolution (e.g. portal creation)
  • takes into account player-thrown projectiles
• added on_player_teleport world-tags action
  • triggers on all (as many as available by vanilla means at least) teleportations
  • does trigger in portals, but not before destination portal resolution.
• added entity_property number provider
  • added entity property providers; currently only used for the matching number provider
• made context copy accept multiple transformers at once, for more efficient transformation
• made context copy transformers able to remove null properties

refactored to com.nerjal class package