meh 0.3

This is a small quick release, but there’s enough features that it needed a release before the larger changes that are to come.

Changes in this release

Next and previous images are cached
Adjust redrawing logic for better responsiveness when resizing windows.
Handle alpha transparencies in PNGs with a hardcoded white background.
All XLib interfacing is done through a generic interface. This makes the code much cleaner and fixed a bug involving unnecessary redraws from expose events.
Small speed increases