Refactoring: (MVVM epic) Bring View logic into ViewModels

[Daggerpov]

Tab Views

• [x] DropletsView
• [x] SearchView
• [x] AppearanceView
• [x] QuotesView
• [x] CommunityView

Sub Views

• [x] HeaderView
• [x] ColorPaletteView
• [x] AuthorView
• [x] SingleQuoteView
• [x] SubmitView

General

• [ ] ContentView
• [ ] InfoView

[Daggerpov]

Will improve SingleQuoteView in #110

Actually already implemented QuoteBox.swift as a ViewModel before formally learning the pattern