CodeSnip Old Code (SVN)

Renamed various properties, fields, method names and parameter concerning category ids.

* Renamed USnippetKindInfo unit as DB.SnippetKind.
* Updated all using units.

* Moved TSnippetKind and TSnippetKinds from DB.USnippet unit to USnippetKindInfo.
* Updated all affected units.

* Renamed USnippets unit as DB.UMain.
* Updated all affected units.

* Extracted code that deals with snippets and snippet lists from USnippets into new DB.USnippet unit.
* Modified affected code accordingly.

* Renamed various types in USnippets to have a database related name.
* Modified affected code.

* Renamed "Snippets" function in USnippets to "Database".
* Updated all using code.

Refactoring:
* Renamed numerous identifiers that refer to "routine" with those that refer to "snippets" where appropriate.
* Updated calling code where required.

Refactoring: Renamed methods of ISnippetsEdit that referred to "Routine" to refer to "Snippet".

Refactoring: TRoutineExtraHelper renamed as TSnippetExtraHelper and made required changes in other units.