Blender Git Loki

bugfix [#23001] Addons do not unregister properly in Blender 2.5.3

Now reloading the user defaults also unloads/loads addons, resetting the state to the one set in the user preferences.

moved addon functions into bpy.utils
- bpy.utils.addon_enable(name, default_set=True)
- bpy.utils.addon_disable(name, default_set=True)
- bpy.utils.addon_reset_all(name, default_set=True)

the user preference operators now just wrap these.