Have protectedRooms accept normal aliases/roomIDs

[ShadowJonathan]

It feels a bit weird to deal with matrix.to URLs and matrix room IDs/aliases at the same time in a config. (protectedRooms vs managementRoom)

Shouldn't we convert it all to using IDs/aliases, but also add a function that will convert matrix.to URLs and matrix URIs to them, for backwards compatibility?

[turt2live]

I'd prefer to drop the config setting and manage the bot only with in-room commands.