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

application/drivermode.cpp

@@ -436,6 +436,7 @@ bool driver_mode::update()
 	Timer::subsystem.sim_total.stop();
 	// the parts of the vehicle update made in the frame, none when paused
 	Timer::subsystem.commit_frame();
+	Timer::subsystem.switching.update();
 
 	Timer::subsystem.loop_audio.start();
 	simulation::Region->update_sounds();

application/driveruipanels.cpp

@@ -1515,6 +1515,7 @@ debug_panel::render_section_renderer() {
     ImGui::PopStyleColor();
     // the physics of the vehicles, timed in the section of the main loop
     ImGui::Checkbox( "let vehicles standing still and held by their brakes sleep (physics.sleepheld)", &Global.physics_sleepheld );
+    ImGui::Checkbox( "one step of the physics in a frame for road vehicles farther than 1 km (physics.roadlod)", &Global.physics_roadlod );
     return true;
 }