Python OS 6 1.2 beta 1

This release is a major release which brings a host of new features.

Most importantly, Python OS supports multiple display sizes, and ships with 320x480 by default. This is a setting that can be changed in the res/settings.json file. This change was facilitated by the introduction of computed Component dimensions. There are also notable improvements to performance, as well as some minor tweaks to design. Several longstanding bugs have been fixed.