Beta 0.5.0

This hopefully will be the last beta release before version 1.0 (fingers crossed). Please report bugs here. Thank you!

Features:

• Added git commit hash to about dialog.
• Added buttons to copy version and git commit hash to clipboard in the about dialog.

Bugfixes:

• Fixed the application icon not working on MacOS platform.
• Fixed issues with chording (area clicking).
• Fixed whitespace at the start of each line messing up allignment of license dialog text.

Tooling:

• Removed Trunk.
• Added unit tests for mouse input and drawing.