add unicode_encode and unicode_decode DSL functions - #326
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Closes #256.
Adds
unicode_encodeandunicode_decodehelper functions, in the same spirit as the existinghex_encode/hex_decodeandurl_decodehelpers.unicode_encodeturns a string into\uXXXXescapes (and\UXXXXXXXXfor runes outside the BMP).unicode_decodereverses it, decoding any\u/\Uescape runs and leaving the rest of the text untouched, so it also works on mixed content. This helps in extractors where a response hands back\uXXXXescaped text (page titles from some sites, for example) and you want to match on the actual characters.Added a round trip test plus a few decode cases, and updated the function signature list test.