Feature: BFEntity Implementation

[GoosiferIO]

The BFEntity structure and its substructures represent the actual instances of placed actors (rather, entities) on the map. When a zoo is loaded, all instances pull from the stored *Types in memory, which in turn are values defined in configuration. These unique entity instances, however, offer properties for individual actors rather than groups.

This structure should have properties such as world coordinates, visibility, type pointers, current actions, and more.