Per-type pointer checking

[kezz]

Whilst implementing the pointer system in various platforms, it became clear that the system creates a considerable amount of duplicated objects that perform identical functions.

Taking Paper's implementation as an example, each Player object will hold a Pointers object that delegates to the same set of functions, regardless of the player.

A per-type pointer registry system could alleviate this issue by registering a type with one pointer that provides data from pointers when given a specific instance of an object.