code cleanup: remove double call to BKE_node_instance_key(), rename ruler (lots of tools are 3d :)), and redundant assignment.


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@55466 954f8c5b-7b00-dc11-b283-0030488c597c
code cleanup: rename editmode functions so we have ED_object_editmode_load/enter/exit


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@55467 954f8c5b-7b00-dc11-b283-0030488c597c