1) General code clean-up in convar manager
2) Fixed bug where convar handles were not being cached for pre-existing convars
3) Fixed bug where a convar's old value and new value were switched in the ConVarChanged hooks
4) Made convar and concmd listings more consistent, I think
5) Alphabetized convar listing
6) Minor clean-up in event manager
--HG--
extra : convert_revision : svn%3A39bc706e-5318-0410-9160-8a85361fbb7c/trunk%40588
