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* Changed `numpy.float` and `numpy.int` types for deprecations in numpy 1.20 (96).
* Make it possible to safely invoke C library from multiple threads on
independent inputs.
Global config functions such as `set_sub_object_limit()`
and `set_extract_pixstack()` still configure global params
(once for all threads), while other functions will retain their data
in thread-local storages, so they can be invoked from multiple threads as
long as they work on independent structures.
Library compilation will now require a C11 compatible compiler, which should
be nowadays available on all supported platforms.
* Mark some pointer parameters with `const *`. This is a backward-compatible
change, but makes it easier to extract constants that can be safely shared
between multiple threads and/or invocations.