Add mutable overload of Project.getTopologicalPackageList.
Add mutable overload of Project.getTopologicalPackageList.

gedaiu/dub,p0nce/dub,Geod24/dub,rjframe/dub,D-Programming-Language/dub,jelmansouri/dub,jeanbaptistelab/dub,grogancolin/dub,Flamaros/dub