Moved common default init/name methods to a base class, common to all plugin types. Added phpdoc comments to various plugin methods. Updated HandBrake plugins to reflect core changes.
Fixed strict errors in foreground and background task classes.
Added init and name methods, which will be common to all Plugins. Removed HandBrake specific methods.
Since the new design is engine agnostic, removed HandBrake from the class names.
