Simulate 3rd party gcode

[Harvie]

Hello.
The gcode simulator in jscut seems pretty useful. Can you please add textarea where i would be able to copypaste gcode from different source and simulate it using jscut simulator? Eg. After manualy specifiing the milling bit type and size.

When jscut generates gcode, it can be put to the same textarea, so we can tweak it and see the results in simulator immediately.