Cherry-pick  #2950 and #3093 to stable-13.0

This allows the back button to dismiss the system keyboard if shown. Additional back-presses revert to default UI behavior.

As a throw-in, I made the same change to KMSample2 

cherrypick(android) - Fix ResourcesUpdateTool crash

Cherrypick #2933 to  stable-13.0

This fixes crashlytic [issue](https://console.firebase.google.com/u/1/project/kmapro-ee779/crashlytics/app/android:com.tavultesoft.kmapro/issues/5abd6c9831c913e93eb75d28da472079) by checking for valid context before setting a preference.

fix(common/lmlayer): use searchTermToKey() on input

change(ios): Web-based popup key longpresses 🍒

fix(ios): iOS 13.4 subkey menu workaround 

fix(ios): prevents in-app keyboard resets

fix(ios): [cherry] popup keys over base keys no longer emit base char

https://community.software.sil.org/t/search-term-to-key-in-lexical-model-not-working-both-ways-by-default/3133

fix(android, stable): Fix globe button crash for 3rd party apps

Cherrypick of #2930 for stable-13.0

fix(ios): corrects OSK height adjustment, banner display issues

fix(web): fixes design mode and content editable issues