Blosc2

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* Added support for ARMv7l platforms (Raspberry Pi). The NEON version
of the bitshuffle filter was not compiling there, and besides it offered
no performance advantage over the generic bitshuffle version (it is 2x to
3x slower actually). So bitshuffle-neon.c has been disabled by default in
all ARM platforms.

* Also, unaligned access has been disabled in all ARM non-64bits platforms.
It turned out that, at least the armv7l CPU in Raspberry Pi 4, had issues
because `__ARM_FEATURE_UNALIGNED` C macro was asserted in the compiler
(both gcc and clang), but it actually made binaries to raise a "Bus error".

* Thanks to Ben Nuttall for providing a Raspberry Pi for tracking down these
issues.

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* Fix ALTIVEC header. Only affects to IBM POWER builds. Thanks to
Michael Kuhn for providing a patch.

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* New AVX512 support for the bitshuffle filter. This is a backport of the upstream
bitshuffle project (https://github.com/kiyo-masui/bitshuffle). Expect up to [20%
better compression speed](https://github.com/Blosc/c-blosc2/pull/567#issuecomment-1789239842)
on AMD Zen4 architecture (7950X3D CPU).

* Add c-blosc2 package definition for Guix. Thanks to Ivan Vilata.

* Properly check calls to `strtol`. Fixes 558.

* Export the `b2nd_copy_buffer` function. This may be useful for other projects
dealing with multidimensional arrays in memory. Thanks to Ivan Vilata.

* Better check that nthreads must be >= 1 and <= INT16_MAX. Fixes 559.

* Fix compile arguments for armv7l. Thanks to Ben Greiner.

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* Fix a variable name in a test that was causing a segfault in some platforms.

* Change tuner's functions signature to return always an error code. This allows
for better error checking when using plugable tuners in Blosc2.

* Do checks when creating contexts.

=============================

* Globally registered new codec `openhtj2k`. This will be loaded dynamically. See PR 557.

* Added a `BLOSC_INFO` macro for details on compression params.

* Added `get_blocksize.c` example on automatic blocksizes.

* Warning fixes.

* Fixes for mingw.

=============================

* Several fixes for the CMake system. Thanks to Axel Huebl. See PR 541 and 542.

* Several fixes for MinGW plaform. Thanks to Biswapriyo Nath. See PR 540 and 543.