Adding a script for handling keep out areas in polygon form

Created by: Misca1234

Repush of https://github.com/pointhi/kicad-footprint-generator/pull/144

Could no longer access the branch locally

Here is a script that create a "keep out area" based on arbitrarily closed polygon

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# 1
f.append(KeepOutArea(nodes=[[0, 0], [4, 0], [4, 4], [0, 4], [-2, 2]], width=0.4))
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# 2
f.append(KeepOutArea(nodes=[[10, 10], [14, 10], [14, 14], [10, 14]], width=0.01))
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# 3
f.append(KeepOutArea(nodes=[[20, 20], [24, 20], [24, 24], [22, 26], [20, 24]], layer="Cmts.User"))
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# 4
f.append(KeepOutArea(nodes=[[-25,-30], [5,-30], [5,-10], [0,-10], [0,-15], [-5,-15], [-5,-20], [-15,-20], [-15,-15], [-20,-15], [-20,-10], [-25,-10]]))
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# 5
f.append(KeepOutArea(nodes=[[15,-30], [20,-30], [20,-25], [25,-25], [25,-20], [30,-20], [35,-20], [35,-25], [40,-25], [40,-30], [45,-30], [45, -10], [15, -10]]))
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# 6
f.append(KeepOutArea(nodes=[[35,5], [37,3], [39,3], [45,10], [38,15], [37,12], [41,8], [36,5]]))