win-capture: Add graphics-hook library

This library is a completely refactored and rewritten version of the
original graphics hook.  The code is more clean, readable, and has a
variety of new features, such as scaling and forcing memory capture.

Currently, only D3D9, 10, and 11 are implemented.  (This commit may be
updated on this branch)

plugins/win-capture/CMakeLists.txt

@@ -24,5 +24,6 @@ target_link_libraries(win-capture
 
 install_obs_plugin_with_data(win-capture data)
 
+add_subdirectory(graphics-hook)
 add_subdirectory(get-graphics-offsets)
 add_subdirectory(inject-helper)