don't use singleton pattern for resource manager in GUI Move ownership of the resource_manager object to the base_qobject class. Store reference to resource_manager object as a member variable in most objects that need to access it. Eliminate static member functions in resource_managar class. Provide a get_resource_manager method in the base_qboject class and a global __get_resource_manager__ function for those instances where we can't easily provide local access to the resource_manager object. There are many changes to many files, but most are straightforward.

--- a/libgui/src/workspace-view.h	Sat Nov 02 15:24:14 2019 -0400
+++ b/libgui/src/workspace-view.h	Fri Nov 01 18:16:49 2019 -0400
@@ -39,13 +39,15 @@
 
 namespace octave
 {
+  class resource_manager;
+
   class workspace_view : public octave_dock_widget
   {
     Q_OBJECT
 
   public:
 
-    workspace_view (QWidget *parent = nullptr);
+    workspace_view (QWidget *parent, resource_manager& rmgr);
 
     ~workspace_view (void) = default;