CodeSnip Old Code (SVN)

* Changed character set testing code in several units to use char set helper functions added to UUnicodeHelper.pas instead of testing directly against literal or constant sets. This prevents Delphi 2010 warnings about WideChar being reduced to byte char in set expressions.
* Changed use of UpCase built-in to use ToUpperCase function added to UUnicodeHelper.pas.
* Added various set handling routines along with ToUpperCase function. These mainly call TCharacter methods on Unicode Delphis and have custom implementations on other Delphis.

Modified TAppInfo.GenerateKey to be Unicode compatible: now uses new ASCIIBytesOf routine (added to UUnicodeHelper unit) to ensure program key contains only ASCII characters.

* Added support for Latin1 code page: string definition, code page constant, custom encoding class and Latin1BytesOf helper function.
* Defined TBytes for non-Unicode Delphis.
* Provided BytesOf function for non-Unicode Delphis.

* Added new UUnicodeHelper unit that contains code designed to aid porting to Unicode.
* Initially new unit contains only the TStringStreamEx class.