core: add DL helper, apply to TrackArt OSD, DankLocationSearch

- unrelated change to add gsettingsOrDconf helpers

core/cmd/dms/commands_common.go

@@ -524,5 +524,6 @@ func getCommonCommands() []*cobra.Command {
 		chromaCmd,
 		doctorCmd,
 		configCmd,
+		dlCmd,
 	}
 }