Total rework of simulator for dev branch. Create separate thread for interrupt processes. Tick-accurate simulation of timers. Non-blocking character input for running in realtime mode. Decouple hardware sim from grbl code as much as possible. Expanded command line options. Provisions for cross-platform solution.

coolant_control.c

@@ -46,7 +46,8 @@ void coolant_stop()
 void coolant_run(uint8_t mode)
 {
   if (sys.state == STATE_CHECK_MODE) { return; }
-  
+
+  protocol_auto_cycle_start();
   protocol_buffer_synchronize(); // Ensure coolant turns on when specified in program.
   if (mode == COOLANT_FLOOD_ENABLE) {
     COOLANT_FLOOD_PORT |= (1 << COOLANT_FLOOD_BIT);