Added boolean to control whether polydata is generated

Disabling this makes the segmentation process faster
because the polydata generation of the airway is
quite slow.
Factored geometry creation into another Slicer CLI module

This portion of the geometry pipeline takes a while to
run. If several attempts are required to find the right
parameters for the segmentation algorithm, the geometry
generation wastes significant amounts of time. You can still
optionally generate the geometry in the AirwaySegmenter
CLI, but if you chose not to during the binary segmentation
phase, you can generate the geometry from the resampled
image, the binary segmentation, and the threshold value
determined by the segmentation algorithm.
Moved files
Updated file content after file renames
Added CLI module to draw line segments between points

This is for connecting airway fragments to enable the
centerline-finding algorithm to work on scans from
patients with fully collapsed airways.