Fixes #4490.
Fixes #4435.

There are three parts to this:

1. Ensure that transient language profiles associated with a disabled
   keyboard are enumerated correctly
2. Stop trusting `LocaleNameToLCID` when it returns a transient language
   id, as it sometimes reports out-of-date values. We don't need to
   trust it in these cases anyway, because we have already collected the
   relevant transient language data from Win8Languages.
3. Finally, setting the profile GUID to `GUID_NULL` is simply tidyup,
   which does not have impact on the running code currently but makes
   state consistent.

I believe that part 2 fixes #4435 because the symptoms are identical.
But as I am unable to repro that particular issue on my machine thus
far, that is an assumption. Hopefully we can get a good test result from
@MakaraSok.

chore(linux): Update readme

auto: increment beta version to 14.0.256

chore(common): Update readme

auto: increment beta version to 14.0.255

fix(windows): ensure valid base layout on install

fix(windows): show version selector for Keyman in installer

fix(windows): represerve keys on setfocus

Fixes #4437.

Makes sure that we don't end up with a base layout that is not using
Latin script at install time.

docs(ios): adds supported l10ns to help/about/whatsnew

Fixes #4409.

If a user attempts to install an older version of Keyman, they need to
be able to choose to install the older version, and not the newer one
offered to them from online. However, the selector was hidden in the
Install Options dialog, even when it should have been accessible.

Fixes #4557.

When focus changes, we need to re-run `_PreserveAltKeys` as settings may
have changed, meaning we have to preserve a different set of keys. I
also made the `_PreserveAltKeys` function idempotent so that we don't
have to worry about cleanup before calling it -- by calling the cleanup
function internally instead.

chore(linux): Fix some lintian warnings for Debian package

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

fix(web): use language code correctly in toolbar

The previous setting didn't complain if uscan didn't find a signature
which doesn't help security wise. It would still allow an attacker
to modify the source package. This change now requires a valid
signature for the source package.

Fixes #4566.

When the toolbar shows a differentiation for the language code, it was
not using the correct minification-safe property name, which resulted in
`[undefined]` being displayed instead.

auto: increment beta version to 14.0.254

fix(developer): Expand filenames before load

chore(linux): Improve Sentry environment setting

chore(android/app): Update whatsnew with available display languages

fix(windows): incxstr could run over buffer with malformed data

* List available display languages
* Add KMEA breaking changes

Fixes #4583.

fix(ios): support for direct downloads of .kmp packages from within the in-app browser

fix(developer): tidy up expansions tests

fix(windows): PreservedKeyMap::MapUSCharToVK line order bug

fix(android): Localize Toast notifications