Changes

rayx-core:
- Added optical elements
  - Paraboloid
- Added light sources
  - Simple Undulator
  - Pixel Source
  - Dipole Source
- Improved code consistency for optical elements and light sources
- Improved test suite
- Fixes for RZP tracing
rayx:
- Added more options to customize the export of rays and speed up the tracing
- Added option to choose GPU
- Improved runtime by optimizing data handling
rayx-ui:
- Added orthographic camera
- Added footprints/heatmaps/histograms for simple optical elements
- Changed default camera position and orientation
- Jump to light source is possible now
- Correctly render slits
- Fixed positioning of light sources
- Fixed triangulation bugs
- Fixed general rendering bugs
General bugfixes and documentation updates

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