Added min, max functions
2 new functions: Cell and Noise

Provides 4 new functions,
Vector and Scalar noise from cell and noise (perlin) from
mathutils.noise library
Updated

Min and max functions
Vector math

Angle functions from vector math library.
Same as acos(u.dot(v))
Fixed text so looks right
Voronoi2D and Delaunay Triangulation

For testing purposes. Voronoi2D needs polygon output and Delaunay needs
edges.
Menu updates

Removes CircleSort. Found another bug.
Add Voronoi2D and Delaunay