Changelog for 1.4 to 1.6.0:

- Added ability to load from a VDF file instead of gameinfo.txt.
- Added ability to load MM:S plugins from VDF files.
- Added new version of SourceHook with the following changes:
- Added API for hooking functions on a virtual table to all instances.
- SH_ADD_HOOK macros now return non-zero hook IDs. Additionally,
the old hook adding/removing syntax is deprecated (but still supported).
- Added SH_REMOVE_HOOK_ID to remove hooks by ID.
- CallClasses have been deprecated. The SH_CALL macro can now take a class
instance pointer rather than a callclass pointer.
- Can now generate dynamic, arbitrary hooks at runtime (see hookmangen).
- Metamod:Source has now received a large internal rewrite to improve coding
standards and to separate internal logic from engine specifics.
- Added mm_basedir cvar to specify Metamod's base folder.
- Added API for getting highest supported IServerPluginCallbacks interface
version.
- Added API for detecting the engine version.
- Added API for getting the VSP-simulation interface upon late loading.
- Added OnUnlinkConCommandBase to IMetamodListner to notify when Metamod:Source
is about to remove a concommand or convar.
- Added the ability for Metamod:Source to load as a VSP instead of through
gameinfo.txt.
- The output of the "meta list" command has been reformatted in order to allow
more space for plugins' name, version, and author fields.
- Sample/Stub plugins have improved building mechanism and code, and will
compile against both MM:S 1.6 for OrangeBox and MM:S 1.4 for Episode 1.