Make writing and reading clipboard symmetric
Make writing and reading clipboard symmetric

Write writes strings in unicode, so the data returned from read should
also be in unicode.

Copy_Os_Str expects the data to be native strings, which might not be in
unicode

zsx/r3,zsx/r3,Pointillistic/rebol-lang,Pointillistic/rebol-lang,Pointillistic/rebol-lang,zsx/r3,Pointillistic/rebol-lang,zsx/r3