add JSON data storage (spells, database?, etc)

[jnharton]

So the idea at the moment is store and load some of the game data from JSON. In particular, my intention is to store spells either as individual json files (one json object per file) or as one big file containing a json object per spell. Some of the code to handle this is written using google-gson, however that library has it's own license (Apache License 2.0). The compatibility of that license with the MIT license the codebase and how the code can be used together without any relicensing is yet to be determined.

google-gson

DEPENDENCY: determine license compatibility