Add whitelisting of bots (e.g. Matrix-Bridge) for ingame messages by ID

Currently, messages sent from Matrix in the In-Game-Discord-Channel don't appear in the game, because the bridge only forwards messages that are not from bots: The messages of Matrix users are transmitted by a bot. I want to add support for making exceptions with respect to the bots that are being blocked by the bridge, such that the bridge bot can be whitelisted and thus the messages of Matrix users can be made visible.