Some small bug fixes

Hi everyone! Just a quick one - we've squished a few annoying bugs and added better crash logging. We'll have a larger update, with invites and a concede button, quite soon.

Full patch notes for your viewing pleasure:

• Fixed a crash on finishing a game after starting a new game using the restart button.
• Fixed another crash that would sometimes happen when you joined a new match.
• Fixed an issue where the game would stay 'running' in Steam after it had crashed or exited.
• Fixed the date formatting to be more consistent.
• Added proper crash dump logging so if it happens we can just ask you for a log file - no more messing around with Command Prompt, hopefully.

Thanks for playing!