Added DON to event callbacks since some events, such as smoke bridge all clear only sends DON events.  Otherwise no trapping of smoke bridge all clear was possible.
Added DON to event callbacks since some events, such as smoke bridge all clear only sends DON events.  Otherwise no trapping of smoke bridge all clear was possible.

evilpete/ISYlib-python,sjthespian/ISYlib-python,fxstein/ISYlib-python,joegross/ISYlib-python