Spacing type radio button for repeat and circular repeat node

[Ripper53]

Closes #2551

1. Added Spacing radio parameter to Repeat node, containing Span, Envelope, Pitch, and Gap options for spacing. See issue for how they must be spaced.
2. Added Angle Pitch float parameter and Spacing radio parameter for Circular Repeat node. The Span option uses the calculations which already existed, the Pitch option rotates the next instance around the radius of the imaginary circle according to the Angle Pitch parameter and places the shape there.