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.

gcode.c

@@ -62,7 +62,7 @@ void gc_sync_position()
 {
   uint8_t i;
   for (i=0; i<N_AXIS; i++) {
-    gc_state.position[i] = sys.position[i]/settings.steps_per_mm[i];
+	 gc_state.position[i] = sys.position[i]/settings.steps_per_mm[i];
   }
 }
 
@@ -75,7 +75,7 @@ static uint8_t gc_check_same_position(float *pos_a, float *pos_b)
   }
   return(true);
 }
-         
+
 // Executes one line of 0-terminated G-Code. The line is assumed to contain only uppercase
 // characters and signed floating point values (no whitespace). Comments and block delete
 // characters have been removed. In this function, all units and positions are converted and