persist realname of always-on clients

[slingamn]

They can change it with /quote setname if necessary.

[clukawski]

I'll take a look at this then

[slingamn]

Implementation note: I think this can just be a new field of AccountSettings. (So far they're all enums and bools, but there's no architectural reason we couldn't have a freeform string in there.)

[slingamn]

Ignore the above note --- settings are updated via CAS (to avoid updates to one field clobbering another). This isn't a good fit for realname updates.

[clukawski]

general notes:

• create AccountManager.saveRealname() AccountManager.loadRealname() for persistence
• check if user set as always-on during registration (opt-out or mandatory), after call to AccountManager.Login() via Client.alwaysOn, call client.markDirty() with new dirty bit for realname
• Client.performWrite() will persist client realname via AccountManager.saveRealname()
• AccountManager.createAlwaysOnClients() load with AccountManager.loadRealname() and sets client.realname via call to Server.AddAlwaysOnClient()
• Client.SetRealname() should call Client.markDirty() with the aforementioned realname dirty bit if always on is set for client