add setTimeOut method in inputevent.lua

adapt all the state machine to use setTimeOut. Now supported gestures
includes tap, double tap and hold.

frontend/ui/ui.lua

@@ -200,6 +200,7 @@ function UIManager:run()
 
 		-- delegate input_event to handler
 		if input_event then
+			DEBUG(input_event)
 			self:sendEvent(input_event)
 		end
 	end