merge remote tracking changes default tip

add support for C-strings in cx_strcast() - resolves #549

apply latest uwproj fixes

implement zalloc() - resolves #679

add base allocator to mempool

stabilizes mempool implementation

make test-compile depend on both static and shared

fix test coverage for cxStdlibAllocator

improve mempool destructor support (3/3)

improve mempool destructor support (2/3)

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