This removes Fretboard. The goal is to reduce cold startup costs associated with loading the experiments on the main thread. We currently have two experiments frameworks in use and should only require one.
* For #345#346 - Adds private browsing theme
Co-authored-by: Sawyer Blatz <sdblatz@gmail.com>
* Abstracts theme management
* Theme browser toolbar
* Remove unused imports
* Begin work on sharedPreferences
* fix lint
* #346 - Refactors ThemeManager to take a callback
* Adds clean status bar and nav bar
* lint
* Themes settings icons better
* Small clean up