Add extra debug output for GetGameState.

Add some more debug.log output for GetGameState, for the case that the
state has to be calculated and is not yet saved.
Implement game state cache.

Cache the last 10 game states calculated, not just the current state.
Change version to 1.00.06.
Merge pull request #20 from domob1812/extra-output

Cache game state more aggressively.