fix(developer): use var not let in definitions

fix(web): first-pass workaround for popup-key corrections

fix(windows): Download keyboard dialog TLS protocol support

Fixes #4716.

We still support Chrome 37 on Android 5.0, which does not permit
use of the `let` keyword in normal conditions.

fix(common/core/web): disambiguation of keys sharing same base key ID

Fixes #4709.

auto: increment beta version to 14.0.265

fix(android): Update styling and set text to black

fix(android/app): Load system keyboard before checking overrides

auto: increment beta version to 14.0.264

fix(developer): support named character codes at end of line

Merge pull request #4699 from keymanapp/fix/developer/validate-keyboard_info-bcp47-canonicalisation-info

chore(developer): upgrade bcp 47 canonicalisation to warning

This does not trigger a build failure; validation warnings currently always pass.
Info messages are currently suppressed with -s which also suppresses the banner,
which is more plumbing than we should change just now.

Merge pull request #4689 from keymanapp/fix/developer/validate-keyboard_info-bcp47-canonicalisation-info

fix(developer): validate keyboard_info should give info on non-canonical bcp47

fix(android/engine): Fix crash when download file fails to copy to cache

fix(developer): &CasedKeys and &MnemonicLayout are not compatible together

fix(windows): start Keyman after setup only if not running

chore(android/engine): Send KMW console errors to Sentry

fix(ios): keyboard search did not alert for lack of net

If a named character code was followed by a `\n`, it would not be
recognised.

The test for `&mnemoniclayout` was incorrectly failing to check the
actual state of `&casedkeys`, which broke all mnemonic layouts.

auto: increment beta version to 14.0.263