CodeSnip Old Code (SVN)

Removed unused units from uses clauses.

* Remove factory classes
* Removed TDatabaseType
* Removed all implementation section

* Modified TSnippetsIOFactory re removal of TDatabaseType: Replaced TSnippetsIOFactory.CreateLoader with TSnippetsIOFactory.CreateMainDBLoader and TSnippetsIOFactory.CreateUserDBLoader methods
* Modified re removal of data IO factories with direct construction data reader and writer objects.

Modified code that loads databases in line with changes to TSnippetsIOFactory.

Modified objects that read and write main and user databases, including nul reader used when one of the databases doesn't exist:
* Removed code that registered reader / writer - now redundant.
* Moved class declarations from implementation to interface sections of unit.
* Except for nul reader, removed references and dependencies on deleted TDatabaseType. Additionally, path to database directory now passed in constructor rather than being determined within read class.

Modified units to work with new garbage collector, TGC from new UGC unit, instead of TAutoObjFree object from removed UAutoFree unit.

Replaced UAutoFree.pas with UGC.pas which provides a garbage collector static class that can be used to manage the lifetime of objects.

Removed obsolete design documentation files - no longer accurate.

Reinstated UStructs unit in uses clause, deleted in error.

Amended TPrefsBaseFrame and descendants with additional abstract methods and their implementations to work with re-implemented preferences dialog box. Each frame now provides information needed by TPreferencesDlg to dynamically create the preferences frames and their host tab sheets:
* Index class function determines relative postion of frame in preferences dialog box.
* DisplayName method provides caption of tab sheet that hosts the frame.
* Frame's HelpKeyword property is set appropriately.
* Concrete frame classes now register themselves with TPreferencesDlg in their initialization sections