planes - 0.5.0

Mouse-sensitive sprites. Hierarchical windows. Drag and drop. All with one new class. No messing with your main loop.

The planes module introduces the "Plane" class which extends PyGame's "Surface" functionality, offering a hierarchy of mouse-sensitive, draggable Surfaces that can be used as sprites, windows, icons or other interactive elements.

In addition, the planes.gui module uses planes to provide basic GUI elements like container, label, text box, option list and button.

'clickndrag' has been renamed to 'planes', this is the first release under the new name.

Planes now handle mouseovers, by default highlighting the Plane. GUI buttons and options will highlight by default. Added PlusMinusBox GUI widget.

Added modules gui.lmr and gui.tmb which enable bitmap image backgrounds for planes GUI widgets. Included a set of default background images.

Improved transparency for GUI widgets.

Added FadingContainer GUI widget which will fade out over time.

Numerous fixes and improvements, along with a documentation update.