Users management

[dani]

We should include a internal auth system to access /admin

[dani]

After some more thoughs, we should not just include an internal auth system for /admin. Instead, we should add a full account management

• rename /admin to something more generic, like /manage (as it won't be used just by admins)
• possibillity to register (create a user account)
• Auth should be managed internally, externally, or a mix of both
• We should be able to create entities (eg: compagny), attach user accounts to entities, and grant permissions on entities
• Each registrated users can go on /manage and manage their own rooms, see their event logs etc...
• They should also be able to set preferences (default cam on/off, alternate theme, email addr etc...)
• Registrated users should be warned when their rooms are about to expire
• Registrated users should see/manage their API keys (probably later)