2D Rewrite Step [1]

-=-=-=-=-=-=-=-=-=-

-Moved drawing code to a single function that takes linked list (should make it easier to optimize in the future).
-Implemented Z ordering of 2D nodes. Node2D and those that inherit have a visibility/Z property that affects drawing order (besides the tree order)
-Removed OpenGL ES 1.x support. Good riddance!

servers/visual/rasterizer_dummy.cpp

@@ -1615,6 +1615,11 @@ void RasterizerDummy::canvas_draw_polygon(int p_vertex_count, const int* p_indic
 void RasterizerDummy::canvas_set_transform(const Matrix32& p_transform) {
 
 
+}
+
+void RasterizerDummy::canvas_render_items(CanvasItem *p_item_list) {
+
+
 }
 
 /* ENVIRONMENT */