[WiP] Add UTF-8 support for String.#228

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JDuchniewicz wants to merge 4 commits intoPolyEngineTeam:devfrom

JDuchniewicz:icu-system

Commits on Feb 20, 2020

Add normalization and collation of UTF-8 strings. Add basic tests.
JDuchniewicz
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Commits on Feb 25, 2020

Fix normalization. Add toASCII transliteration method. Add tests.
JDuchniewicz
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Commits on Feb 26, 2020

Minor fixes. Use StringBuilder for Join operation
JDuchniewicz
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Commits on Mar 2, 2020

Add Memory iterator. Add tests.
JDuchniewicz
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