py api: add Object.update_from_editmode(),
Useful for python exporters to avoid toggling editmode on export, moved into own function ED_object_editmode_load(obedit).

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@55465 954f8c5b-7b00-dc11-b283-0030488c597c