Modifiers: Add option to directly specify a 2D transform for UVWarp

Currently the only option is to warp based on the transform of other
objects, which is inconvenient if you want to e.g. control it through
a driver - you need to set up a dummy object and go through that,
which is clunky and should be unneccessary.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D6690

release/scripts/startup/bl_ui/properties_data_modifier.py

@@ -1455,6 +1455,19 @@ class DATA_PT_modifiers(ModifierButtonsPanel, Panel):
             col.label(text="Bone:")
             col.prop_search(md, "bone_to", obj.data, "bones", text="")
 
+        split = layout.split()
+        col = split.column()
+        col.label(text="Offset:")
+        col.prop(md, "offset", text="")
+
+        col = split.column()
+        col.label(text="Scale:")
+        col.prop(md, "scale", text="")
+
+        col = split.column()
+        col.label(text="Rotate:")
+        col.prop(md, "rotation", text="")
+
         split = layout.split()
 
         col = split.column()