The bot should resist banning/blocking itself or its admins

[turt2live]

• [x] Don't let moderators set ACLs that prevent the bot from participating
• [x] Prevent globs from matching the bot's user ID (but still allow people to set rules like @*:*)
• [ ] Don't let moderators demote the bot in rooms that are protected. Allow promotions though.
• [x] Apply the above behaviour to people in the management room too