0.1.8 adds support for sprites

Starting from 0.1.8 you no longer have to manually re-draw the screen from your main loop but can instead use sprites.

The system maintains a list of sprites to be rendered each frame, so a typical main loop only needs to call Graphics.render() to draw all of its sprites onto the screen in the correct order (yes, you can order sprites arbitrarily).

A couple of other issues have been resolved, for instance it's now possible to draw something that is partially or wholly off-screen.

There's an animated clock demo included as part of this release. It's deliberately simple so as to be short, but hopefully it demonstrates the cleanness of the sprite and sound interfaces.

Now, you simply create a new sprite object and it is automatically drawn along with all the other sprites when Graphics.render() is invoked