Filleted parametric wade's projector ceiling mount

This is a remodeled version of Wade's projector ceiling mount, but with smaller holes (M5 with 0.3mm clearance) and filleted arms.

This includes fillet.scad from https://github.com/clothbot/ClothBotCreations/blob/master/utilities/fillet.scad, which generates very nice filleted joints.

The projector plate is redesigned for the BenQ W1070+ (a.k.a. HT1075), and is parametric so you can generate one for any projector if you figure out the XY-coordinates of the screw holes in mm.

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