player_added event triggered twice with different kwargs

[avanwinkle]

When a player is added to MPF, game.py broadcasts a player_added event with the player number as the num kwarg:

{ "name": "player_added", "player": "<Player 2>", "num": 2, "cmd": "player_added" }

However the bcp_interface.py also emits directly a player_added event (bypassing the event manager) that with the player number as the player_num kwarg:

{ "player_num": 2, "cmd": "player_added" }

This can cause errors on BCP clients that subscribe to the player_added event because either kwarg may not be present.

The solution should be (probably) to remove the BCP event and rely on the event handler's event to broadcast.