Adsg-core

- Rendering and terminology updates

- Many dot rendering improvements
- Ability to also print svg or the raw dot
- Show design variable and metrics values
- Frozen and local viz-js library version
- Fixed connection edge display with grouping node

- **Renamed ADSG to DSG (Design Space Graph) to be more generic**
- Improved documentation about `get_nodes_by_subtype`
- Throws error if unavailable nodes are declared as start nodes
- Added a helper function to add individual nodes to a DSG, and export them in dot
- Connection edge labels now show nr of repeated connections the connection choice has been resolved
- Display choice constraints in dot export
- Render nodes/edges legend in tutorials
- Updated paper references
- Fixed some memory issues related to code running with a timeout

- Makes ADSG rendering available also outside notebooks
- Fix bug with premature definition of start nodes

- Fixed a bug where nodes with incompatibility constraints were not recognized as floating nodes
- Added dependency license checks

First ADSG core public release:
- ADSG implementation, including `BasicADSG` public API
- Documentation, tutorials, tests