Blender Git Loki

rigidbody operators poll functions were mixing up CTX_data_active_object/ED_object_active_context.
- replace ED_operator_rigidbody_add_poll with ED_operator_object_active_editable_mesh
- replace ED_operator_rigidbody_active_poll with ED_operator_scene_editable for operators that use the entire selection.
- remove rigid-body from objects that are converted from meshes to curves, while this isnt crashing it is confusing to see in the UI.