Add WithInlineStatus helper function

Very similar to WithWaitingStatus, except that the status is shown in a view
next to the affected item, rather than in the status bar.

Not used by anything yet; again, committing separately to get smaller commits.

pkg/gui/controllers.go

@@ -112,6 +112,7 @@ func (gui *Gui) resetHelpersAndControllers() {
 		Confirmation:    helpers.NewConfirmationHelper(helperCommon),
 		Mode:            modeHelper,
 		AppStatus:       appStatusHelper,
+		InlineStatus:    helpers.NewInlineStatusHelper(helperCommon),
 		WindowArrangement: helpers.NewWindowArrangementHelper(
 			gui.c,
 			windowHelper,