DRAFT Source geometry distortion shape nodes

MeshSurface allows distortion of surface of sources, image shader vertex change of mesh surface, new handles to distort mesh in geometry view

src/ImageShader.h

@@ -22,6 +22,7 @@ public:
 
     // uniforms
     float stipple;
+    glm::mat4 iNodes;
 };
 
 class AlphaShader : public ImageShader