Reimplement monitor capture

- Implement windows monitor capture (code is so much cleaner than in
   OBS1).  Will implement duplication capture later

 - Add GDI texture support to d3d11 graphics library

 - Fix precision issue with sleep timing, you have to call
   timeBeginPeriod otherwise windows sleep will be totally erratic.

obs/window-basic-main.cpp

@@ -71,6 +71,7 @@ void OBSBasic::OBSInit()
 	obs_load_module("mac-capture");
 #elif _WIN32
 	obs_load_module("win-wasapi");
+	obs_load_module("win-capture");
 #endif
 
 	/* HACK: fixes a qt bug with native widgets with native repaint */