Rigidbody: Allow triangle mesh shapes to deform during simulation

Only supported when using the "Deform" mesh source.

release/scripts/startup/bl_ui/properties_physics_rigidbody.py

@@ -73,6 +73,9 @@ class PHYSICS_PT_rigid_body_collisions(PHYSICS_PT_rigidbody_panel, Panel):
         if rbo.collision_shape in {'MESH', 'CONVEX_HULL'}:
             layout.prop(rbo, "mesh_source", text="Source")
 
+        if rbo.collision_shape == 'MESH' and rbo.mesh_source == 'DEFORM':
+            layout.prop(rbo, "use_deform", text="Deforming")
+
         split = layout.split()
 
         col = split.column()