support an edje scaling factor. parts can selectively say "yes.. scale me!"

support an edje scaling factor. parts can selectively say "yes.. scale me!"
:)... this allows e etc. to adapt to massivelyt different dpi screens with
slickness that even svg can't get to... why? you scale just what NEEDS
scaling (text, button sizes, and other limiting elements). other bits like
borders, padding etc. can remain pixel-perfect and thus the look is amazing.
pixel-perfect drawing with scalable adapting.

git-svn-id: svn+ssh://svn.enlightenment.org/var/svn/e/trunk/edje@35895 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33