if we can't sleep, at least have the processor block for 100ms

src/PowerFSM.cpp

@@ -84,6 +84,9 @@ static void lsIdle()
                     powerFSM.trigger(EVENT_WAKE_TIMER);
                 }
             }
+        } else {
+            // Someone says we can't sleep now, so just save some power by sleeping the CPU for 100ms or so
+            delay(100);
         }
     } else {
         // Time to stop sleeping!