Turn almost all Listeners into abstract interfaces

rtgui/epd.h

@@ -42,6 +42,7 @@ public:
     void setBatchMode   (bool batchMode);
 
     void adjusterChanged (Adjuster* a, double newval);
+    void adjusterAutoToggled(Adjuster* a, bool newval);
     void enabledChanged  ();
     void setAdjusterBehavior (bool stAdd, bool gAdd, bool esAdd, bool scAdd, bool rAdd);
 };