Add more room link configuration

[mymindstorm]

Commands:

• list all current room links
• make the link command more intuitive

Channel links:

• Option to send messages from every channel to a room
• Mumble -> Matrix recursively (Sending recursively doesn't work #17)

Presence:

• Work in @amalon's commit as a presence option amalon@0be3729
• Normal matrix online / offline presence option