Simplify UUID usage and harmonise force loaded chunks

[aksiome]

Tasks

• Use the new selector module to return a string selector (player name or entity string UUID) instead of an UUID array.
• Use the new B5-0-0-0-4 persistent entity pointer with uuid array instead of the selector module (keep targeted_entity and change the view module)
• Move every persistent entity to the only chunk that should be forceloaded (-30000000 1600)
• Edit contribution doc to add new entity and which chunk should be forceloaded

Updated modules:

• hitbox
• math
• move
• position
• raycast
• schedule
• sidebar
• vector
• view