* 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
* d2records/: suppressing function legnth lint errors for record loaders
* d2gamescreen/character_select.go: broke up OnLoad method to reduce complexity
* d2ui/button.go: suppressing funlen lint error, can't reduce function size
