🎨 Port package to types

This refactors DefaultPackage into types.Package and gets rid of the
interface. This is a preceeding for a follow up where accessors will be
removed from the code.
It also does several cleanup, so we get rid also of some unneeded
dependencies.

cmd/database/remove.go

@@ -36,7 +36,7 @@ This commands takes multiple packages as arguments and prunes their entries from
 
 		Run: func(cmd *cobra.Command, args []string) {
 
-			systemDB := util.DefaultContext.Config.GetSystemDB()
+			systemDB := util.SystemDB(util.DefaultContext.Config)
 
 			for _, a := range args {
 				pack, err := helpers.ParsePackageStr(a)