* Remove d2config.Config singleton
* refactored config file bootstrap
* `d2loader.Loader` adds the config directories during init
* `d2asset.AssetManager` loads the config file during init
* mpq verification logic removed from d2config; this is done by d2loader
* added `errorMessage` to `d2app.App` for setting the error message for the error screen.
* fixed loader test
* refactored logging in d2config, d2record, and d2asset
* asset manager, record manager, and file loader now utilitize d2util.Logger
* added colored logging to d2util.Logger (excluding windows platforms)
* removed mpq file verification from d2config; d2loader handles this
* record loaders now use the record manager's logger for printing info
* added command line argument for setting log level (`--loglevel 4`, `-l4`, or `-l 4`
* added `LogLevel` parameter to config file
* default log level will show errors, warnings, and info log messages
* specifying log level as an argument overrides setting from config file
* fixed log level tests
* WIP refactor of d2map stuff
* more d2map refactor
adding realm init to game client
passing map engine from client and server into realm at init
change `generate map packet` to have act and level index as data
* client explodes, but getting there
* realm now initializes, networking works, but map generators dont currently do anything
* changed the way that level type records are loaded
* fixed funcs for level data lookups
* started implementing level generator, currently crashing
* client no longer exploding
* d2networking refactor
put exports into d2client.go and d2server.go
kept GameClient and GameServer methods into their respective files
made methods for packet handlers instead of the giant switch statements
* bugfix: getting first level id by act
* minor refactor of gamescreen for readability
* towns now generate on server start, create player takes act and level id as args, levels have their own map engine
