Support for Proxy Objects (and others)

Support for Proxy Objects (and others)

Proxy objects allow you to use another image as the source of an image.
Essentially allowing the same object to be rendered multiple times.  One
object (the source) is the original, each additional 'copy' is an image with
evas_object_image_source_set.

This is complete.

Also add partially working arbitrary maps, and arbitrary clipping.
Unfortunately both have some issues yet to be resolved (waiting on the next
feature to get merged together).

git-svn-id: svn+ssh://svn.enlightenment.org/var/svn/e/trunk/evas@56777 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33