we play a little fast and loose with Timer, ensure it gets no vtable

firmware/util/timer.h

@@ -10,7 +10,7 @@
  * Helper class with "has X amount of time elapsed since most recent reset" methods
  * Brand new instances have most recent reset time far in the past, i.e. "hasElapse" is true for any reasonable range
  */
-class Timer {
+class Timer final {
 public:
 	Timer();
 	void reset();