Integrate new rich-text-editor + Bugfixes

• Minor bugfixes
• Integrate new rich text editor (still needs to be refactored / documented for clarity)
• New MemriTextField that improves keyboard support
• Start transition to ASTableView for improved list rendering

My apologies for any formatting issues. I tried running SwiftFormat, however this touched most files in the project so would best be left for its own pull request.