ENH: support fiducial file transfer between Slicer and CLIs
Expands the application logic to support reading and writing fiducial files. Expands the CLI module UI helper to create a fiducial node selection combo box when a point file type is detected. Expands the CLI module logic to manage fiducial files. Need to link to the Markups module to set the coordinate system flag on the markups storage node. Currently setting an attribute on the fiducial node to pass the coordinate system flag along to ApplyTask where the files get written to disk. Added CreateDefaultDisplayNodes for the fiducial node so it can be called for output node setup. Add input and output fiducial file examples with coordinate systems set to LPS to the execution model tour. Required updates to the SlicerExecutionModel to define the new XML tag --pointfile, the pull request was merged, so the external project file is updated.
Issue #2979