Homeserver claiming

[a13xmt]

It should be possible to claim homeserver on matrixstats for actual homeserver owners. Such action should enable the following functionality:
1)Opt-out homeserver completely
2)Alter homeserver description, status and details
3)Toggle homeserver healthmap visibility
4)Tune the bot behavior based on scopes that homeserver interested in. For example, owner may allow /publicRooms method for room listening, but disallow /sync method to prevent room crawling for the whole server. This can be used to balance indexing and privacy (assuming the public rooms can be considered as private by someone)
5)Observe the rooms from #62 and alter them accordingly. Ability to opt-out rooms.