Second release with new features, extended testing and resolved bugs.
**Mayor Changes:**
- added feature to save a perspective as new initial perspective for loaded point clouds
- changed initial viewport calculation (centered point cloud with zoom to show everything)
- changed config (clipping plane ) to cover for very large point clouds
- changed code formatting to black
- added unit and integration tests (and github pipeline)
- added graphical dialogue to edit the config/ settings
- added new menu actions