Turn almost all Listeners into abstract interfaces

rtgui/filebrowser.cc

@@ -1991,7 +1991,11 @@ void FileBrowser::setExportPanel (ExportPanel* expanel)
     exportPanel->setExportPanelListener (this);
 }
 
-void FileBrowser::updateProfileList ()
+void FileBrowser::storeCurrentValue()
+{
+}
+
+void FileBrowser::updateProfileList()
 {
     // submenu applmenu
     int p = 0;
@@ -2085,6 +2089,10 @@ void FileBrowser::updateProfileList ()
     subMenuList.clear();
 }
 
+void FileBrowser::restoreValue()
+{
+}
+
 void FileBrowser::openRequested( std::vector<FileBrowserEntry*> mselected)
 {
     std::vector<Thumbnail*> entries;