fix(web): event handling for TouchAliasElement's blinking caret

Merge pull request #4635 from keymanapp/fix/windows/4490-4435-transient-profiles-and-invalid-language-codes

fix(windows): Handle disabled profiles and invalid language ids

fix(windows): hotkeys correctly ignore right modifier keys

fix(windows): context help links

auto: increment beta version to 14.0.258

docs(common): Update readme

fix(common/core/web): Add keyboard check for scriptObject

auto: increment beta version to 14.0.257

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   id, as it sometimes reports out-of-date values.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 #4619.

The hotkey check in keyman32 would ignore right modifier keys, but the
behaviour was not quite right: it actually needs to take the modifier
into account, but just not treat it as a valid modifier.

While fixing this, I noticed that some of the tests in the
`KeyLanguageSwitchPress` function were using the wrong modifier flags. I
wish I had fewer different modifier flag sets but that ship has probably
sailed.

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 #4558.

This makes a number of fixes to get the context help working correctly
in Keyman 14:

1. Adds support for `redirect:` header in help .md files so that we can
   do redirects for the context content in Keyman for Windows help in the
   lua filters.
2. Renames Keyman for Windows help files to .htm, because that's what
   the .chm format is expecting, and what Delphi assumes for its .chm
   integration, and thus splits the html and htm lua filters.
3. Renames and makes more consistent the various context help pages.
4. Adds redirects for all pages that have sufficient content on other
   pages.
5. Fixes the instantiation of help in various Keyman for Windows forms.
6. Defaults to opening help from the Keyman source repo if the calling
   app is running in the source repo (this is just a development-side
   tweak that simplifies my life).

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.