feat: PyPatchMatch shared library for Linux & OSX

[iwr-redmond]

Windows users are advantaged with the presence of a precompiled binary for PyPatchMatch.

It would be helpful to either offer a similar facility for Linux & OSX users or include relevant PyPI packages, such as opencv-python and cmake, to make the compilation process less reliant on unmanaged external dependencies.

[iwr-redmond]

This proposal may be possible on Linux (Ubuntu) with some fiddling. The PatchMatch makefile collects two system outputs relating to OpenCV:

pkg-config --cflags opencv4 - location of the cv2 hpp files

These can be found in the source distribution of opencv-python, albeit spread out in multiple folders in the tarball.

pkg-config --libs opencv4 - linked/compiled libraries list

I reckon this may not be needed for the Python wheel, which is statically compiled.

[iwr-redmond]

An alternative might be to migrate from the C++ PatchMatch to the new Cython implementation, which would eliminate the need for end user compilation.