Fix #37036, pack and refresh button not aligned anymore. Also add
operator for opening images in the image editor header, it's easily one
of the most common operations, don't see why it has to be only accessed
from menu.


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk@60679 954f8c5b-7b00-dc11-b283-0030488c597c
fix [#37038] User prefs > Input - Category names cut off


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk@60680 954f8c5b-7b00-dc11-b283-0030488c597c