Fixes #1100

[Android] Fix crashes when input connection or package name is null

This cherry picks the commits from #1103 onto master

[Mac] #1090 - cherry pick fix and tests from stable

[Windows] Update to WIX 3.11.1 plus other minor environment riders

[developer] Use CEF in touch layout editor

I attempted unsuccessfully to find an actual failing case so I could add a unit test for this. Even though I couldn't, I agree that it is the correct logic, so I'm making the change as Marc suggested.

[Android] Add round launcher icons

[developer] CEF replacing embedded IE

[Mac] Fixed last stable version number in history.md

[Mac] #1079 - Cherry-pick of OSK Help button fix to master

From https://blog.xamarin.com/round-launcher-icons-in-android-7-1/
"Circular launcher icons have become standard since the introduction of Android Nougat 7.1"

This is a cosmetic change adding round launcher icons for the Keyman app.

[iOS] #1060 - Bookmark add button enabled only when title/url have text

Fixes #1060