Merge pull request #1741 from keymanapp/windows-comapi-buffer-overrun-in-getdefaultkeyboardid-64-10.0

[Windows] [10.0] Fix FieldWorks LT-19402, buffer overrun in GetDefaultKeyboardID for 64 bit

[Windows] [Stable-10.0] Back port of stability fixes for Keyman Desktop 10.0

[Windows] [Stable-10.0] Avoid crash when security software blocks Keyman Configuration from setting various registry values.

[Windows] [Stable-10.0] Switching between Keyman keyboards in same language using TSF interface could fail

[desktop][stable] Cleanup Desktop help references to PNG files

[Developer] Add "-add-help-link" parameter to kmcomp

* change parameter to `-add-help-link` to match api.keyman.com schema
* update schema
* also validate existing "helpLink" field

Reachability crash alleviation

[Android][stable] Swap TextView positions when end < start

Also cleaned up the history
10.0.507 was the last release
10.0.506 not published (failed CI build)

Fixes sillsdev/keyman-keyman.com#210

* Fixes references to osk-tibetan.png and usage-none.png
* Fix lower-casing of .png desktop images

[Windows] Mitigation for #1285 for 10.0 stable. Adds a mitigation for issues with installation under certain languages in Windows 10 1803 and later

[Windows] Mitigation for #1285. Adds a mitigation for issues with installation under certain languages in Windows 10 1803 and later

[Windows] Add Kannada localization (10.0 stable)

[Android] Fix crash when displaying preview key

Fixes Crashlytics  [crash report](https://console.firebase.google.com/u/0/project/kmapro-ee779/crashlytics/app/android:com.tavultesoft.kmapro/issues/5b59a79f6007d59fcdced3c2)  that's caused by trying to display the preview key when the token is null.

[Developer] Avoid a crash in package editor when compiled keyboard file is missing

[Windows] Fixup installer .wxs sources for use with WiX 3.11 (RegistryKey/@Action)