[Feature Request] Settings Screen

[AedDev]

Implement a settings screen to allow the user to change various settings. For example:

• From #2: Manage categories for channel suggestions, white/-blacklist for tags
• From #6: Default poll time for raid target polls
• From #8: Enable / Disable visibility of the logged in user's viewer count
• From #13: Enable / Disable auto-visit when raiding a channel
• From #18: Change app language
• From #20: Enable / Disable Dark-Mode

[AedDev]

Resolved with PR #31