Settings screen

[tommyxchow]

Add a settings view so that the user can customize the app's features.

• [x] #45
• [x] #25
• [x] #26
• [x] #33
• [x] #67
• [x] #65
• [x] #66
• [ ] Add toggles for enabling/disabling BTTV, FFZ, and 7TV emotes
• [ ] Add GIF toggle
• [x] Add chat text field toggle
• [ ] Emote quality slider
• [ ] Config IRC options (enable sub alerts, bans/timeouts visibility)
• [x] #98
• [x] #99