Add Cell map and Coordinate Systems support

[RabidCicada]

Added cell map system and multi-coordinate system support. There is support for:

• Reading in cells and their properties from config files
• Auto generating cell coordinates based on selected coordinate system.
• • This includes using a simple coordinate system for notation like oddr and using full hex coordinates under the hood.
• Setting attributes on cells
• Seaming multiple cells/cell-segments together in the hex coordinate system
• Importing Cell definitions into other Cell definition files. This allows map segments to be defined and then assembled similar to gloomhaven.
• Ability to convert between coordinate systems with converter helper functions
• extension converter helper functions can be registered
• arbitrary transforms for cells can be registered at run time and their values passed through the config files
• Extension file format readers can be registered for reading int he cell data (currently supported yml and json)