fix clone_func not checked for being nonnull

implements cxMapIntersection() and cxMapListIntersection() - resolves #555

difference shall not check already present items in the destination - fixes #753

specify the intersection functions

add cxCollectionCompareFunc() macro

fix typo bug in cxListDifference() - resolves #745

add tests for cxListDifference() - resolves #751

remove mingw support (we have MSVC support) + fix regression on macos platform

add support for multiple parallel versions of ucx

remove *.pc attribute that might cause compatibility issues

protect against possible spaces in the paths

add pkgconf support

ucx 3.2 is not binary compatible - increase the LIBVERSION

fix that the symlinks for the libraries are not relative

cxListDifference() sets the sorted flag if it can guarantee that

add implementation for cxListDifference() - issue #745

continue to fix warnings on certain compilers due to implicit cast from fptr to bool

fix warnings on certain compilers due to implicit cast from fptr to bool

add more test coverage for new map functions and fixes some issues

simplify clone implementations

add tests for cxMapDifference() and cxMapListDifference()

add documentation for cxMapDifference() and cxMapListDifference()

default NULL allocator to cxDefaultAllocator

add implementations for map difference

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