make CX_STR more robust when used in macro expansions

fix cx_strdup() not using cx_strcast()

add documentation for cx_strsplit()

document cx_strreplace() family of functions and improve docstrings

document substring family of functions

write section in string docu about comparisons and concatenation

write Section about basic string functions

start documenting the string functions

add missing documentation about creating iterators

add iterator documentation

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mercurial