Merge #21694: build: Use XLIFF file to provide more context to Transifex translators

35d52397e72f3ab96a7797148666b501d50b445d Add bitcoin_en.xlf intermediate translation file to the repo (Hennadii Stepanov)
99686b65195fe990144be1a6326061e9c6ae506c qt [experimental]: Add a translation comment and a disambiguation string (Hennadii Stepanov)
f959b75e8c5964dec59a1dce937ee2244cce33df build: Add Qt lconvert tool to depends (Hennadii Stepanov)
2045e4cdd26920665300f21be5b08fe66bde4a41 build: Use XLIFF file to provide more context to Transifex translators (Hennadii Stepanov)

Pull request description:

  Currently, only a class name is provided to the Transifex translators as a context. Neither `disambiguation` parameter of the `tr()` function nor [translator comments](https://doc.qt.io/qt-5/i18n-source-translation.html#translator-comments), being included as XML elements to `*.ts` translation files, are not parsed by the Transifex due to its [limited support](https://docs.transifex.com/formats/qt-ts) of such files.

  This PR makes possible to provide all of the context details via an intermediate [XLIFF](https://docs.transifex.com/formats/xliff) translation file.

  With this PR `make -C src translate` produces the `src/qt/locale/bitcoin_en.xlf` file which must be provided to the Transifex as a translation source instead of `src/qt/locale/bitcoin_en.ts`.

  Closes #21465.

  An example translatable string with additional `<context>` and `<note>` XML elements: https://github.com/bitcoin/bitcoin/blob/35d52397e72f3ab96a7797148666b501d50b445d/src/qt/locale/bitcoin_en.xlf#L126-L132

ACKs for top commit:
  laanwj:
    ACK 35d52397e72f3ab96a7797148666b501d50b445d

Tree-SHA512: cc19e3c09501d240153550d75d7697b5f824cb553f4223beaff66be4d3e6f98d7b5bb14f2d1e1d5ad014eaaa498a7f672e7ff0054ced53ace8c1e6f7e49f6d8a

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