edje: support adding physics worlds and bodies

edje: support adding physics worlds and bodies

Just an initial support, it's not possible to configure worlds
or bodies. Just adding it. Only possible customization is the
type of body.

It defines what's the collision shape and type (rigid / soft).
It can't be changed over time, so it's not on part's description.

It's expected that many cases won't be covered yet.

If you have ephysics installed and don't want it, just use
--disable-ephysics. It shouldn't affect anything for cases
where ephysics is not installed.

SVN revision: 79793