Extra BMP Unicode and Windows

[brodieG]

Something is wrong with how windows is handling the out of BMP unicode code points. For example, "\U0001F600" shows up as "<+UF600>" on windows, basically reading the long form U code, but truncating the first four digits".

For now we just commented out the emoji tests that used it since this is completely optional functionality for vetr, but we'll need to examine this more closely, particularly in the context of ansistrings.

[brodieG]

Probably because windows is utf-16/ucs2...