write introduction for the Utilities Section docs/3.1

basic structur for the strings chapter docs/3.1

merge recent changes into docs branch docs/3.1

optimize cx_arl_find_remove for sorted arrays - fixes #547

remove dependency to ssize_t - fixes #552

improve cx_strchr()

simplify array access

fix wrong inequality

extract unescape_unicode_string() and fix rages

fix memory leaks

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mercurial