implement pybullet.changeTexture. For now, the width/height has to match the target texture unique id, otherwise crashes may happen (a check for width/height match will be added)

See also examples\pybullet\examples\changeTexture.py

examples/CommonInterfaces/CommonGUIHelperInterface.h

@@ -40,6 +40,7 @@ struct GUIHelperInterface
 	virtual void removeGraphicsInstance(int graphicsUid) {}
 	virtual void changeRGBAColor(int instanceUid, const double rgbaColor[4]) {}
 	virtual void changeSpecularColor(int instanceUid, const double specularColor[3]) {}
+	virtual void changeTexture(int textureUniqueId, const unsigned char* rgbTexels, int width, int height){}
 
 	virtual int getShapeIndexFromInstance(int instanceUid){return -1;}	
 	virtual void replaceTexture(int shapeIndex, int textureUid){}