Send Penalty game flow command to basestations

[jorritolthuis]

Currently, there is no game flow command available for end-of-game penalties.

The only way to distinguish between in-game penalties and end-of-game penalties is waiting for penalties after COMM_END_GAME after COMM_SECOND_HALF_OVERTIME.
Since the RefBox already knows when it is in end-of-game penalties, this can be communicated easily.

My proposal is to add COMM_END_OF_GAME_PENALTY to the game flows. This makes it easier and more robust to determine the type of penalties. This is useful since the rules differ between the two types.

[jorritolthuis]

Fixed in #55 for new protocol