Fixes #7273.

Adds 4 kmx system stores to allow existing configuration tools to load
and process KMXPlus files without modification:

* `TSS_NAME` (first `<name>`)
* `TSS_COMPILEDVERSION` (only if `options.addCompilerVersion == true`)
* `TSS_KEYBOARDVERSION` (from `<version number>`)
* `TSS_TARGETS` (currently always 'desktop', will later include more
  targets)

In order for `TSS_COMPILEDVERSION` to be handled correctly, needed to
plumb in the new `CompilerOptions` interface. This could be a separate
PR, but the changes are not huge, so opted to append the changes here.

Updates related tests and fixtures. Refactored some of the e2e helpers
into helpers/index.ts for use with the metadata-compiler tests.

chore(core): verify StartGroup in kmx load 🙀

chore(core): use builder_ for build.sh 🙀

chore: make checksum optional 🙀

chore: merge master into feature-ldml 🙀

chore(web): disable browserstack on non-web-specific builds

chore:  try disabling concurrency for browserstack tests

Merge pull request #7219 from keymanapp/fix/developer/7216-suppress-repeated-warnings-unreachable-code

fix(developer): suppress repeated warnings about unreachable code

fix(developer): compiler mismatch on currentLine

docs(windows): add steps for using testhost debugging

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

This is the first baby step in good verification of a .kmx file. A place
to add more tests.

@keymanapp-test-bot skip

The presence of this file tells CI to use the new builder_ style
parameters for build.sh.

Once all branches for 16.0+ are updated to merge the
chore/core/7247-use-builder-for-build-sh branch, then we can remove this
file and the corresponding bash test branches in CI.

Refactoring of build.sh to use the builder_ functions. The script should
now be a lot cleaner. Usage is available with `core/build.sh --help`

Targets are :x86, :x64, :wasm, :arch (linux/mac).

Supports additional requirements of Linux build (--target-path,
--configure).

By default will attempt to build all available targets.

Actions are: clean, configure, build, test, install, uninstall.

The install and uninstall actions only work for linux and mac targets at
present.

refactor(developer): kmc - encapsulate strs and elem items for sort 🙀

chore(developer): kmc - use local reference for json schema 🙀

refactor(developer): rename `kmldmlc` to `kmc` 🙀

chore(developer): remove name from meta section 🙀

Because BrowserStack tests are unreliable, I am disabling them for any
builds that are not specifically targeting web. Two ways that the tests
can be enabled:

1. Include '(web)' in the PR title
2. Include the label test-browserstack

This only impacts builds in the CI test environment, not anything else.

See build-utils-ci.inc.sh for helper functions for accessing PR
metadata, and build-utils-ci.test.sh for unit tests for this
functionality.

auto: increment master version to 16.0.61

fix(android): Standardize language ID in language picker menu

We're still getting sporadic test failures with BrowserStack. So per one
discussion online, attempting to run without concurrency to see if it
improves stability.

I note that the video from tests where we "fail to capture" shows a
browser with an error: "Safari Can't Connect to the Server" "Safari
can't open the page "localhost:9879/?id=75185158" because Safari can't
connect to the server "localhost".

https://automate.browserstack.com/dashboard/v2/builds/419c59decb8e12303e45e1f4bad1b945252df532/sessions/19712158833ce57592b66a50433965e4146fc972

fix(windows) Update unit tests for tsf bkspace

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

chore(core): fixup km_kbp_event docs