Move turtle forward without brushing

[A1rPun]

I would like to call .forward() or .fd() without enabling the brush.
I'm using .up() and .down() to control the brush but forward implicitly enables the brush and I would like to know why this is intended behaviour.

The fix for me would be removing these lines from drawille.py.

prev_brush_state = self.brush_on
self.brush_on = True
self.brush_on = prev_brush_state

I'm currently having a blast using drawille!

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