Changes

Add basic raytrace components (#1194)

* Move files to geocel and rename RunArgs

* Remove demo rasterizer for now

* Add Image and test

* Add image line view and test

* Add raytracer and test

* Use size and add num_lines accessor

* Create a separate file for image interface

* Revert to using const ref

* Add typedef to imager interface

* Support unit input for image

* Disable test

* Add missing IO from image input

* Rename test images

* Add documentation from review feedback

* Add check and tests for invalid basis function

* Add detailed description of basis vector construction