#46 Implement Photoshop Stained Glass filter

[Maurits Rijk]

This filter is pretty straightforward to implement.
Parameters:

2 <= Cell Size <= 50
1 <= Border Thickness <= 20
0 <= Light Intensity <= 10

Steps:

1) Divide picture in hexagons
2) Fill hexagon with randomly picked color in this hexagon
3) Draw hexagon borders with foreground color

[Maurits Rijk]

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Photoshop algorithm based on Voronoi diagrams