Fixes iOS Get Started

[Developer] Add basic file format support for lexical model packages to Developer

[Developer] Reorganize developer/js with a more conventional file structure

[Mac] Add notarization for 10.14.5 and later versions

[Windows] Keyman for FirstVoices

Co-Authored-By: Joshua Horton <joshua_horton@sil.org>

[Windows] Support installing packages with keyboards that are disabled by default; support opening configuration at first run

[Android] [Windows] [iOS] Merge build of keyboards for FirstVoices apps

[ios] reload table data so deletion or addition shows immediately

[Web] "Enable Predictions" as sole factor in for activating predictive banner

[iOS] Slide-deletion for keyboards via Settings menu