new isssue detections for log parser
consistent reaction with emoji only / text when can't
ability to disable commands at runtime (fixes#56)
command to check for game updates
various other bugfixes
implemented psn crawling for ps3 game metadata (mostly for thumbnails)
implemented game thumbnails for game embeds
fixed usage of dbcontext
some other bugfixes
RPCS3 Compatibility Bot reimplemented in C# for .NET Core
Current status of this PR:
* tested and targeted for .NET Core 2.1
* all functionality is either on par or improved compared to the python version
* compatibility with current bot.db should be preserved in all upgrade scenarios
* some bot management commands were changed (now under !sudo bot)
* standard help generator for the new discord client is ... different;
compatibility with old format could be restored through custom formatter if needed
* everything has been split in more loosely tied components for easier extensibility and maintenance
* log parsing has been rewritten and should work ~2x as fast
