[ecore] Put order in header file, splitting function groups in contiguous chunks.

[ecore] Put order in header file, splitting function groups in contiguous chunks.

    Sorry for having to pratically rewrite the header, but the other way
    to get docs right would be to put lots of @addtogroup around several
    chunks of the file, which is ugly too and doesn't organize anything.

    I have tested ecore with that and it seems to be okay.

git-svn-id: http://svn.enlightenment.org/svn/e/trunk/ecore@62307 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33