Restore games from log files

[ahasselbring]

Basic functionality exists now, but there are more things to do:

• if the log starts with a metadata entry, the launcher should show the settings according to that entry. Then, either it should not be possible to modify them, or the modifications should be used in the new game (currently, the competition settings and team settings from the launcher are simply ignored, except for the competition id which influences the minimum window size)
• while replaying events, the game state should be checked for consistency. This is complicated by the fact that timer actions aren't visible separately in the replayed game, but they do appear separately in the log file.