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Depending on the content QR can use different encoding modes which can be
a lot more efficient than using the universal 8bit mode we were using
unconditionally so far.

For the Base45 encoded EU DGC vaccination certificates this makes the codes
we generate about 20-30% larger than needed which is noticeable but still
manageable. For the SHC vaccination certificates which are encoded in about
1500 digits this completely degenerates into unscannably large codes
though.

With this change we use libqrencode's built-in functionality to select the
best encoding automatically.

If libdmtx isn't available Prison::createBarcode returns null, causing
prison-datamatrixtest to segfault. Considering there's not much to test
in this case, it's probably best to just skip the test.

Helps seeing things in one place

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Reverts change that slipped in by 8ee4c591,
as it prevents usage of BUILD_SHARED_LIBS otherwise for those doing
static builds

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clang-tidy checks:
readability-isolate-declaration and readability-braces-around-statements

KF task: https://phabricator.kde.org/T14729

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This requires a larger rework of the currently purely textual API, which
only works with binary content for other formats by relying on Latin1
encoding not damaging binary data. For QR this doesn't work though, as
unlike any other format, QR has built-in support for a subset of Unicode,
and therefore non-Latin1 content does not imply generic binary encoding
there.

Therefore both the C++ and QML API now can take either a string or a byte
array as input, and each barcode format needs to check which one to use and
convert it according to its own needs.

For the simple 1D formats only supporting an ASCII subset, this doesn't
really make a difference, for the complex ones a number of extra tests
have been added to protect against regressions.

The practical need for binary QR code content comes from Indian vaccination
certificates which currently get severely corrupted.

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Going below the preferred size is not ideal as it impacts the ability
for the code to be scanned again, but on small phone screens this can
be necessary for very large codes to be displayable at all.

Happens for example with digital vaccination certificate codes.

-DQT_NO_FOREACH

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Use simulated installed headers as provided by ecm_generate_headers-
in test app code.

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KF6 task: https://phabricator.kde.org/T14467

NO_CHANGELOG