feat(engine): rewrite player_info & npc_info packets

[ultraviolet-jordan]

• Caches player & npc update blocks. They are cached arrays. Appearances stay cached forever until a player is removed from the world.
• Is able to know the sizes of update blocks before writing the packets.
• Exact move is still written on demand because of the observer problem.
• Renames mask to masks.
• Removes this.alreadyFacedEntity property.
• Keeps all of the effective results as before.
• Removes the static masks from Player/Npc and creates a new InfoProt class.
• Removes a bunch of lookups to World.getPlayer or World.getNpc

My testing shows about a 40-60ms gain in performance on the high end.

Applying masks to 2000 players in a single tick.

2000 dense/sparse players idling.

Logging in is slightly faster because of the caching.

Idle (Sparse)

Before

After

2000 Updates (Dense)

Before

After

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Dense is faster to loop than sparse because our getNearbyPlayers function works faster with a smaller "view distance".