Tools: add scripts for generating data file with Unicode digits for Utf32Utils
Add and use generated data file with Uncode digits
Utf32Utils: add "IsDigit()" and "GetDigitValue()"
CharsetConverter: add "charUtf32toWstr()" function
Utf32Utils: add "NaturalCompare()" for comparing string using natural numbers order
Utf32Utils: add skeleton for case folding
Tools: add scripts for generating data file with Unicode case folding for Utf32Utils
Add and use generated data for Uncode case folding
Utf32Utils: add "FoldCase()"