win-capture: Add game capture

This adds the windows version of game capture.

New features:

- An option to hook any fullscreen application automatically (that
  doesn't have borders) so that no specific window configuration is
  required.  Definitely a sorely needed feature

- An option to force memory capture for the sake of compatibility with
  things such as SLI, multi-adapter setups (usually laptops), as well as
  the ability to be used with the OpenGL renderer

- An optimization option to force scaling on the GPU before texture
  transfer, reducing the transfer bandwidth (which is especially
  important for compatibility capture)

- An optimization option to limit framerate to the current OBS framerate
  to improve capture performance (mostly useful for compatibility
  capture)

- An option to capture third-party overlays (such as steam)

- Logging improvements, game capture log will now be sent via pipe
  instead of written to a separate file, making diagnosing problems a
  little bit easier

plugins/win-capture/plugin-main.c

@@ -5,10 +5,27 @@ OBS_MODULE_USE_DEFAULT_LOCALE("win-capture", "en-US")
 
 extern struct obs_source_info monitor_capture_info;
 extern struct obs_source_info window_capture_info;
+extern struct obs_source_info game_capture_info;
+
+extern bool load_graphics_offsets(bool is32bit);
+
+/* temporary, will eventually be erased once we figure out how to create both
+ * 32bit and 64bit versions of the helpers/hook */
+#ifdef _WIN64
+#define IS32BIT false
+#else
+#define IS32BIT true
+#endif
 
 bool obs_module_load(void)
 {
 	obs_register_source(&monitor_capture_info);
 	obs_register_source(&window_capture_info);
+
+	if (load_graphics_offsets(IS32BIT)) {
+		load_graphics_offsets(!IS32BIT);
+		obs_register_source(&game_capture_info);
+	}
+
 	return true;
 }