fixes that cx_tree_search() did not investigate subtrees with equally good distance

fix allocator of some printf.h functions not being const - fixes #611

fix implementation of cxBufferTerminate() - fixes #631

add cxMempoolTransferObject() - resolves #640

remove warning regarding destruction order, because it is actually not a problem

add cxMempoolTransfer() - partially resolves #640

start development of UCX 3.2

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