Blender Git Loki

Fix T91123: Freeing meshes in edit-mode leaks memory

Freeing the edit-mesh pointer wasn't free the edit-mesh data it's self.

Unlinking from the outliner or through the Python API leaked memory.

This didn't often cause leaks in practice since ED_editors_exit
exits edit-mode for all objects.

Now freeing mesh data frees the edit-mode data as well,
this matches the behavior of other object types that support edit-mode.