Improve appearance of playlist items display
Refactor mod sections and make them overridable
Fix invalid mod combinations potentially being selectable at a game level
Add ModUtils class for validating mod usages
Improve auto-scrolling logic for drawable channels
For safety purposes... In implementing the previous tests, I found that using mod.Object.GetType() can lead to bad assertions since the same ModProxy class is used for all mocked classes.
Fix PlaylistLoungeTestScene appearing very narrow
Make playlist settings area taller to better match screen aspect ratio