Function injectCommands

Marlin/src/lcd/extui/ui_api.cpp:958–958

  void injectCommands_P(PGM_P const gcode) { queue.inject_P(gcode); }
  void injectCommands(char * const gcode)  { queue.inject(gcode); }

  bool commandsInQueue() { return (planner.has_blocks_queued() || queue.has_commands_queued()); }