Preliminary working version of TinyRenderer for standalone demos,

it works without OpenGL dependency now, so it runs in the cloud :-)
Add scaling support for TinyRenderer, remove some un-used normal mapping in TinyRenderer shader, expose light_dir_world,
remove accidental hard-coded path in tga write_tga_file,
Fix InverseDynamicsExampleCreateFunc, enum has to start at 0

examples/InverseDynamics/InverseDynamicsExample.h

@@ -18,8 +18,8 @@ subject to the following restrictions:
 
 enum btInverseDynamicsExampleOptions
 {
-	BT_ID_LOAD_URDF=1,
-	BT_ID_PROGRAMMATICALLY=2
+	BT_ID_LOAD_URDF=0,
+	BT_ID_PROGRAMMATICALLY=1
 };
 
 class CommonExampleInterface*    InverseDynamicsExampleCreateFunc(struct CommonExampleOptions& options);