Automap could change pan speed with the zoom

[Christopher D]

I find it annoying how, no matter what the zoom level is, the automap pans at the same speed. I'm used to how in ZDoom you can move more quickly around the map when you zoom out of it.

[Braden Obrzut]

• Automap panning speed is now dependant on zoom level. Resolves issue #235.

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