add attributes to printf functions

change prefix of UCX_PRINTF_BUFSIZE to CX

add utils tests

fix public header destination

tests for compare functions

separate iterators and mutating iterators

#224 add cxListAddArray()

use //-style single line comments everywhere

fix cx_array_copy() unintentionally shrinking the array

#219: fix off-by-one bug in cx_arl_remove()

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