WinFangs use an Elm image instead of a rectangle for their background, and others can change the image.
All winFangs now get a complimentary box.
Scenri figures out it's own evas, and size.  Clean up an unneeded obj variable.  Plus more comments.
Much clean up and commentary in extantz.c following that last commit.

No longer using the box, despite it now being a freebie.  Don't need to create the box either now.

Ephysics is inited early.

Added comments about the layers.

Instead of creating our own background image, just change the texture of the winFang one.

Rearrange the bits for better stacking..