Fixes: on phone, a longpress key, where its parent key has a override modifier set, will get the layer modifier instead of the override

Show suggested languages first in the picker dialog for adding languages to a keyboard

Support fail-on-warning correctly for kmw and kmp targets

Add documentation links, remove stale files, and fixup installation references to interfaces

[KeymanWeb] The Deadkey Rework

[Windows] When installing a package, use BCP47 tag from package metadata in preference to kmx data

[Web] Check API endpoints for BCP-47

[Android] Add Material Design icons

[Mac] Update history.md for alpha 10.0

 * Update `keymanCloudRequest` to query for `languageidtype=bcp47`
 * Change root Samples and Testing pages to use BCP-47 codes

[Android] Report Unit tests back to Teamcity