Blender Git Loki

Fix outliner mode toggling with multi-object pose/edit mode

For edit/pose modes clicking in the mode-column would include other
selected objects (besides the active object), causing other objects to
remain in the mode even though Control wasn't held.

Also replace `ED_object_mode_generic_exit(...)` on all objects with a
single call to `ED_object_mode_set(...)` so switching modes will only
exit the current mode, leaving objects in other modes unchanged.