* Fix linter warnings

* Add further unit testing

* Code reformatting

* Further documentation and testing

* Reomve no longer necessary enum GeometricSurface

* cargo xtask ci

* Remove GeometricSurface enum by using dyn reference

* absolute value for angle check

* extra cehck for off-axis angle

* oaps are now defined via their effective off-axis focal length and the off axis angle

* changed input of parabolic mirror to use the effective focal length