Replaced Modelica.Icons.TypesPackage by Icons.Package in Modelica.Media.Interfaces.Types, since PartialMedium extends from Types and then suddenly all Media had a "Types" package icon.

git-svn-id: https://svn.modelica.org/projects/Modelica/trunk@6739 7ce873d0-865f-4ce7-a662-4bb36ea78beb