Add game logging

[Qazzquimby]

Add game logging for later analysis.

Requirements:

• Easy to add new heroes and maps without breaking previous logs.
• Time and date logged with match, for filtering by server patch.
• Log length of game.
• Log winning team.
• Show hero total playtime per team as a
• Accurately remove bots from logging (historically difficult)
• Preferably low file size, as the log accumulates over long periods.
• Preferably human readable format.
  See logging mechanism in Unreal 300 bot for reference.
  Analytics for the Unreal 300 bot log format are already complete, but the log format could likely be improved.

With manual map selection, can also log maps for offense/defense balance and map winrates.
With OCR can log players, for player win rates and mmr.