Plotting planes and their intersection in 3D

Function 'plotPlanes' plots planes/lines in 3D; 'plotIntersection' plots intersection of the planes.

1) plotPlanes.m
- plots planes and lines in 3D defined either by directional vectors or by normal vectors.

Example:
A = [1 1 0;0 0 1]; Ashift = [1 1 1];
B = [1 1 1]; C = [1 1 0]

plotPlanes(A,'d',Ashift,B,'Normal',C)

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2) plotIntersection.m
- plots intersection of planes/lines. Only planes/lines going through (0,0,0) (i.e. unshifted) can be plotted (due to functionality of findIntersection.m).

Example:
A = [1 1 0;0 0 1];
B = [1 1 1];

plotIntersection(A,B)
plotIntersection(A,'Normal',B)