IDE: Use the new interface for project and package in Delphi converter.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45901 4005530d-fff6-0310-9dd1-cebe43e6787f
IdeIntf: use the base class TIDEProjPackBase in TProjectFileDescriptor.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45902 4005530d-fff6-0310-9dd1-cebe43e6787f