Make the options page sexy

[zeagler]

The pop-up dialogs look okay, but they would look way better if they were sub-activities that followed the theme of the main settings page. Then the "Done" button can be removed in favor of a themed back arrow at the top of the activity. (really just an arrow with the same font/color as the Settings heading...)

• [x] User Levels get an activity (depends on #54)
• [x] Choose Chords gets an activity, the chord types should en/dis-able like the chord inversion setting
• [x] Hint settings get an activity
• [x] Clear Scores can be removed as the option also exists on the score page
• [x] Chord Inversion/Pitch Bending/Instrument get moved into a Playback Options activity
• [x] All activities get a back arrow

[zeagler]

Chord types have been moved an activity, it looks better.

[zeagler]

Not as great as I was hoping but it's fine.