build 181128. coupler sounds enhancement, minor ai logic tweaks, minor bug fixes

editoruipanels.h

@@ -24,8 +24,12 @@ public:
 
 private:
 // methods
+    void update_group();
     bool render_group();
 
 // members
     scene::basic_node const *m_node { nullptr }; // scene node bound to the panel
+    scene::group_handle m_grouphandle { null_handle }; // scene group bound to the panel
+    std::string m_groupprefix;
+    std::vector<text_line> m_grouplines;
 };