[*] Added new API for loading/unloading plugins from other plugins.
[*] Added support for new HL SDK API functions:
QueryClientCvarValue()
ClientCvar()
[*] Added IS_QUERYING_CLIENT_CVAR for new client cvar engine API.
[*] Changed cmd_doplug() to make sure a complete string was not misinterpreted as a number.
[*] Fixed DLCLOSE() to not accept NULL handles.
[*] Fixed a bug where API call wrappers were not saving global states. (This caused problems mainly with bot plugins.)
[*] Fixed reloading failed plugins with "meta reload".
[*] Bumped internal API version to 5:12 (old plugins might ask to be updated).
[*] Commands "meta version" and "meta info" show ifvers for metamod/plugins.
[*] Added mod recognition for Digital Paintball 2.2.
[*] Added mod recognition for Firearms 3.0.