Use static classes for job timers (#9940)

Marlin/Marlin_main.cpp

@@ -260,6 +260,7 @@
 #include "pins_arduino.h"
 #include "math.h"
 #include "nozzle.h"
+#include "printcounter.h"
 #include "duration_t.h"
 #include "types.h"
 #include "gcode.h"
@@ -515,13 +516,6 @@ millis_t previous_cmd_ms = 0;
 static millis_t max_inactive_time = 0;
 static millis_t stepper_inactive_time = (DEFAULT_STEPPER_DEACTIVE_TIME) * 1000UL;
 
-// Print Job Timer
-#if ENABLED(PRINTCOUNTER)
-  PrintCounter print_job_timer = PrintCounter();
-#else
-  Stopwatch print_job_timer = Stopwatch();
-#endif
-
 // Auto Power Control
 #if ENABLED(AUTO_POWER_CONTROL)
   #define PSU_ON()  powerManager.power_on()
@@ -13703,6 +13697,8 @@ void setup() {
 
   thermalManager.init();    // Initialize temperature loop
 
+  print_job_timer.init();   // Initial setup of print job timer
+
   #if ENABLED(USE_WATCHDOG)
     watchdog_init();
   #endif