Changes the test_utils scripts to provide a more robust initiailization callback timer for automated CI testing.

Adds a KeymanWeb 'shutdown' API function for testing for a better engine reload/reset.  Resolves IFrame problem.

KeymanWeb Testing Infrastructure

Enable keyboard supplementary plane mode based on keyboard metadata rather than stub metadata

Changed deployment target version to 10.7 for test target

This prevents compiler warnings for deprecated methods/properties.

Add extra feedback in the web debug window

Use api.keyman.com instead of r.keymanweb.com on Keyman for Android

[Mac] Removed commented out code

These were changes I made but failed to stage in my final commit for the PR 550.

Added plumbing for unit testing IM.

Also added a couple TODO comments not actually related to the work in this branch.

[Web] Fix KMW executeHardwareKeystroke

[Android] Improve UX for KMP distribution

During PR #507, embedded hardware keystrokes got broken. This fixes the accessor.

Refactor duplicate code in `useLocalKMP()`

Due to Android's limited set of regex characters for intent actions, any local `.kmp*` file triggers the Keyman app. (e.g. `.kmp` is treated the same as `.kmpo`). Added Toast notifications for when the intent inadvertently triggers the Keyman app.

Also updated PackageActivity to display the package name when no `welcome.htm`  file exists.

[Android] Remove redundant res/ folder

`KMEA/res/` existed from the original code-base, but is not used. (KMEA uses `KMEA/app/src/main/res/`

Use kmp.json where possible, not kmp.inf, so we get Unicode data for strings