Host parseble output for M109, M190 and M303

Make the output of M105 more similar to Repetier.
Make the text-print pert of M105 an extra function to make it reusable. `print_heaterstates()`
Use `print_heaterstates()` in M019, M190 and M303

Marlin/Marlin.h

@@ -351,6 +351,10 @@ extern uint8_t active_extruder;
   extern void digipot_i2c_init();
 #endif
 
+#if HAS_TEMP_0 || HAS_TEMP_BED || ENABLED(HEATER_0_USES_MAX6675)
+  void print_heaterstates();
+#endif
+
 extern void calculate_volumetric_multipliers();
 
 #endif //MARLIN_H