fix missing cxMempoolFree in json allocator test

add support for allocators to the json parser

fix cx_array_advanced_realloc to handle reallocation of NULL arrays, consistent with standard realloc behavior

remove map detach function - fixes #487

make names of destroy and free functions consistent - fixes #484

missing comma in map iterator docs

cxBufferFree() now calls cxBufferDestroy()

automatically disable szmul builtin when testing with coverage

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