fix gtao glitches; add timer to measure animation phase

Timer.h

@@ -58,6 +58,7 @@ struct subsystem_stopwatches {
     stopwatch gfx_reflections;
     stopwatch gfx_swap;
     stopwatch gfx_gui;
+    stopwatch gfx_animate;
     stopwatch sim_total;
     stopwatch sim_dynamics;
     stopwatch sim_events;