Merging r6426 through r6466 from trunk to ogl-es branch

Note: Updated IShaderConstantSetCallBack not yet supported by ogl-es drivers


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/branches/ogl-es@6467 dfc29bdd-3216-0410-991c-e03cc46cb475

tools/GUIEditor/main.cpp

@@ -72,7 +72,7 @@ int main()
 		}
 
 		// be nice to CPU
-		device->sleep(10);
+		device->yield();
 		if (!device->isWindowActive())
 			device->sleep(90);
 	}