chore(android): Specify build tools version on other projects

feat(android/engine): Add other IME's to the Keyboard Picker menu

auto: increment master version to 15.0.158

fix(linux): Fix ibus-keyman integration tests 🎫

chore(developer): tweak language metadata message

chore(windows): Consolidate documentation for Windows devboxes

Co-authored-by: Darcy Wong <darcy_wong@sil.org>

feat(common/core/desktop): Allow preserved key support

While Android Studio Gradle plugin should automatically use a default version of build tools, we can specify it:
https://developer.android.com/studio/releases/build-tools

Attempting to resolve lint exceptions on the build agent.

Co-authored-by: Eberhard Beilharz <ermshiperete@users.noreply.github.com>

Also update issue comment for future removal of winows processor code

Co-authored-by: Marc Durdin <marc@durdin.net>

The pkeys was using the wrong counter as a index
in the map check therefore matching the incorrect key

Relates to https://community.software.sil.org/t/why-does-the-details-tab-in-keyman-developer-still-refer-to-keyman-10/5612/3

fix(web): restore `dragEnd` function 🔥

Relates to #5947.

I resolved a merge conflict in #5947 in the wrong direction and
accidentally deleted the `dragEnd` function. This restores it.

chore(developer): move kcframe into its own folder

fix(developer): render OSK nicely on touch devices

fix(web): support saving focus for custom OSK interactions

fix(web): improve keyboard switch performance

fix(web): remove obsolete popupBaseTarget

auto: increment master version to 15.0.157