Create Filter or StatsGenerator Extension to easily generate a Composite phase.

A basic implementation would have a fixed radius and cylindrical shape with a regular spacing. Advanced implementations would allow the following:

## Placement ##

+ Regular Grid
+ Random
+ Min Distance between fibers

## Shape ##

+ Cylinder
+ Define Radius
+ Rectangular
+ Arbitrary Polygon Shape

## Orientation ##

+ Use Axis ODF to define long axis orientation
+ Allow variation in the orientation
+ Fixed orientation

## Size Variance ##

+ Fixed Size
+ Gaussian size distribution. (Or some other distribution)

This could just be a stand alone filter where you can insert a "Composite" phase into anything (Experimental data, imported data, or Synthetic data) or we could extend the current "Phase" paradigm of StatsGenerator to add a Composite phase, then add a filter for "insert composite phase".

Having it in StatsGenerator would provide the proper playground for the GUI elements that would probably be needed.