Reviewed by David Kilzer.

        Use UChar instead of wchar_t in UnicodeWinCE
        https://bugs.webkit.org/show_bug.cgi?id=47904

        Make UnicodeWinCE more portable, so we can use it for other ports too.

        * wtf/unicode/wince/UnicodeWinCE.cpp:
        (WTF::Unicode::toLower):
        (WTF::Unicode::toUpper):
        (WTF::Unicode::foldCase):
        (WTF::Unicode::isPrintableChar):
        (WTF::Unicode::isSpace):
        (WTF::Unicode::isLetter):
        (WTF::Unicode::isUpper):
        (WTF::Unicode::isLower):
        (WTF::Unicode::isDigit):
        (WTF::Unicode::isPunct):
        (WTF::Unicode::isAlphanumeric):
        (WTF::Unicode::toTitleCase):
        (WTF::Unicode::mirroredChar):
        (WTF::Unicode::digitValue):
        * wtf/unicode/wince/UnicodeWinCE.h:
        (WTF::Unicode::isSeparatorSpace):
        (WTF::Unicode::isHighSurrogate):
        (WTF::Unicode::isLowSurrogate):
        (WTF::Unicode::umemcasecmp):
        (WTF::Unicode::surrogateToUcs4):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@70074 268f45cc-cd09-0410-ab3c-d52691b4dbfc