George Wright fcc1a07ccd Add some APIs to StringUtils (flutter/engine#25043)
* Add the following APIs to StringUtils:

- NumberToString16
- JoinString
- ReplaceChars
- WideToUTF16
- UTF16ToWide

Implement the following APIs for Windows:

- UTF8ToUTF16
- UTF16ToUTF8

* Review comments

Add a couple TODOs for decimal formatting and use std::u16string::npos
rather than std::string::npos.

* Update licences_flutter

Co-authored-by: Chris Bracken <chris@bracken.jp>
2021-03-17 15:44:47 -07:00
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