Single window support

All windows are to be managed via MainWindow in the GUI package - this ensures that only one can ever exist, which also makes recording gameplay with OBS and the like possible.

Demo ready build

Fixed a few bugs.

Minor bug fix update

Fixes one issue: WAV playback inside a JAR was broken. Now it's no longer broken.

First major feature update

• Important bug fix for the image and sound loaders.
• Upgrade to Java SE 13.
• Adds direction utilities.
• Adds an object model for games to build on.
• Exports all the new packages these changes added.

A minor update

• Removed the cache viewers.
• Adjusted the constructor for ColorShader to take a Color, instead of 3 integers.

First alpha release

Initial alpha version. Only the loaders exist for images and WAV sounds, plus image shading and compositing support. Image loaders cache their results internally.