Overhauled the settings tab

[ergoxiv]

Note: Aether-Tools/AetherToolsWpf#6 should be merged before this can be rebased and merged.

Moves Anamnesis' settings into a page-style layout with four categories:

• General: Contains all interface and file/directory settings.
• Input & Hotkeys: Contains the rotation-slider wrap setting & all hotkey settings.
• Personalization: Contains the application theme and gallery settings.
• Connections: Contains all external service settings.

If you have any feedback on the design, let me know and we can think of better solutions.

[ergoxiv]

If you think the settings tab needs a search bar, now would be the time to implement it as searching through pages would require a somewhat different approach: Instead of having a different XAML file for each page, everything would be in a single file with visibility toggles determining what's shown on the screen.

Implemented.

[StoiaCode]

LGTM?

[ergoxiv]

Should be ready to merge then. I moved the lib commit checkout from my fork to the main repo.