Tracker | Map types

[NoahShomette]

update for version 0.2

Bevy Sparse Tilemap now supports different map types as of 0.2. Users can create their own map types and extend this crate to whatever map types they want/need.

This issue is now a tracker for implementing all the different map types we want.

The crate should support the following grid types:

• Hexagonal: Implemented as of 0.2
• Square: Implemented from 0.1
• Isometric grids.