The sample plugin/extension msvc10 project files and Makefiles have recently been updated in mmsource-central
, including the addition of configurations for building for CS:GO.
Also check out the MM:S Dev Wiki
to see the Porting to Swarm and CS:GO
article, and additionally the Porting to Left 4 Dead
article first if you're coming up from CS:S or an earlier engine.
The CS:GO sdk can be found here
Anything outside of the public/ dir, aside from cusercmd and ctakedamageinfo are unlikely to have been reversed, but it should be plenty for plugins. Feel free to request more.