UTF16Compatibility

U16_2_U8

static std::string U16_2_U8(const std::u16string str)

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Will convert str (a UTF-16 string) to a regular std::string.
The naming convention is U16 (like UTF-16) 2 (like "to") U8 (like UTF-8).

It will just cram everything in UTF-8!

Every character that does not exist in UTF-8 will get corrupted!
Only use this function if you KNOW that all characters are within UTF-8!

If you want to escape UTF-16 to UTF-8, you would want to use EscapeUTF16().