perf(physics): road vehicles farther than 1 km from the camera go by one step of the physics in a frame (physics.roadlod); count what resets the switching time of the vehicles (compressor, mains, diesel, physics woken) in the debug panel

tests/unit/engine_stubs.cpp

@@ -6,6 +6,7 @@
 #include "stdafx.h"
 #include "utilities/Globals.h"
 #include "utilities/Logs.h"
+#include "utilities/Timer.h"
 #include "scene/scenenodegroups.h"
 #include "scene/scenelayers.h"
 
@@ -20,6 +21,12 @@ global_settings &GetGlobalSettings() {
 	return settings;
 }
 
+// timers of the debug panel, which the physics counts its switching in ---------------------------------
+
+namespace Timer {
+subsystem_stopwatches subsystem; // NOSONAR the engine's extern global, utilities/Timer.h
+}
+
 // logs: quiet, unless EU07_UNIT_TESTS_LOG is set --------------------------------------------------
 
 namespace {