Gateway config (channel rules)

Channel configuration for each protocol.

⚠️ Needs to be lowercase Below you can find how the channels (protocolchannel, and protocol2channel) should be filled in

* irc        - #channel (# is required) 
* slack      - channel (without the #)
* discord    - channel (without the #)
* mattermost - channel (the channel name as seen in the URL, not the displayname)
               https://yourmattermostserver/yourteam/channels/yourchannel <- yourchannel
* gitter     - username/room (as seen in the gitter.im url)
* xmpp       - channel
* telegram   - chatid (a large negative number, eg -123456789)
  see (https://www.linkedin.com/pulse/telegram-bots-beginners-marco-frau)
* hipchat    - id_channel (see https://www.hipchat.com/account/xmpp for the correct channel)
* rocketchat - #channel (# is required (also needed for private channels!)
* matrix     - #channel:server (eg #yourchannel:matrix.org)
               encrypted rooms are not supported in matrix
* steam      - chatid (a large number).
               The number in the URL when you click "enter chat room" in the browser