auto: increment beta version to 15.0.235

chore(linux): Update Debian changelog

chore(linux): Fix l10n language mappings

chore(common): Add Crowdin strings for Portuguese (pt-PT)

auto: increment beta version to 15.0.234

Also rename the .po files to match the new mappings:

- `bwr_NT.po` -> `brw_NG.po`: the language shows up as `bwr-ng` in
  Crowdin, and there's no `NT` country code.
- `ha_HG.po` -> `ha.po`: the language shows up as `ha` in Crowdin and
  there's no `HG` country code.
- `shu_latn.po` -> `shu@latin.po`: the convention seems to be to put
  the script after `@` sign.

fix(linux): test fileVersion during package install

chore(android/app): Add description for referrer response error

Add an entry to match what got uploaded to Debian.

- patch `is_fcitx_running()` so that tests will work without X11
- move common test code to methods
- move some tests to subtests

fix(linux): Remove tab completion warning

auto: increment beta version to 15.0.233

Fixes #6256

This is done by replacing the deprecated `imp` module.

Fixes #6227.

chore(common): Update km strings

chore(common): Update Crowding strings for Azerbaijani

feat(web): prediction casing follows current layer redux

auto: increment beta version to 15.0.232

fix(android/engine): Update countSurrogatePairs()

auto: increment beta version to 15.0.231

fix(windows): framework for switching of pipeline

Fixes #6507.

Reintroduces #6459 which implemented #6455.

Fixes #6455.

This involved adding an extra hint to the data passed into the lexical
model layer, being the CasingForm that the current layer wants to use.

Given there are several entry points to the lexical model layer, this
meant a few places where we needed to check the current layer.

I refactored the very long function `InputProcessor.processKeyEvent` to
extract out the `buildAlternates` function. There should be no
functional changes to the `buildAlternates` code. But it makes
`processKeyEvent` significantly easier to read.

chore(linux): Update changelog file

chore: Revert "feat(web): prediction casing follows current layer"

fix(windows): don't log before checking nil when installing keyboard