CodeSnip Old Code (SVN)

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

* 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 TRoutineHTML as TSnippetHTML.

Renamed units:
* UEditRoutineAction as UEditSnippetAction
* URoutineAction as USnippetAction
* URoutineCreditsParser as USnippetCreditsParser
* URoutineDoc as USnippetDoc
* URoutineExtraHelper as USnippetExtraHelper
* URoutineHTML as USnippetHTML
* URTFRoutineDoc as URTFSnippetDoc
* UTextRoutineDoc as UTextSnippetDoc
Modified units that use the renamed units accordingly.