WIP: Refactor profiles

[smichel17]

The latest build includes these changes:

• Profiles are now sorted by transparency, so the next profile action in the notification will cycle through them in an order that makes sense.
• When moving the sliders on the main screen, if you set them to the saved profile, that profile will be shown as active, not custom

I thought this would be a simple change but it ended up being quite involved. I am not done with implementing it, so there's a couple known bugs left to fix:

• [x] Occasionally selecting the 'custom' profile from the drop-down will load the wrong values
• [x] Performance: anything to do with changing the active profile may be slow/laggy

If you find any other bugs, please let me know :)

[smichel17]

Rebased and merged into master (d84bf809)