CodeSnip Old Code (SVN)

* Moved IsHexDigit routine from UUnicodeHelper unit to UUtils.
* Removed from UUnicodeHelper unit all character test and case conversion routines that mapped directly onto methods of TCharacter or to CharInSet in SysUtils unit.
* Modified units that used these routines to use replacements in Characters, SysUtils and UUtils units.

Updated copyright date where required on some files modified in 2010.

Merged delphi2010-port branch back into trunk.

Merged non-conflicted changes from /branches/proxy-server:164-203 branch.

Changes made were:
* Added support for using a proxy server when CodeSnip accesses the internet.
* New dialog box and Tools menu item added to enable proxy server to be configured.
* Help file updated.
* A third party encryption unit was added to enable proxy server passwords to be stored in encrypted format.
* New settings section added to store proxy server information on a per-user basis.
* Small number of refactorings,