Clingraph

- Added functionality to the context to be called with for integration with clinguin system
- clinguin_fontname: To get the fontname of clinguin
- color : To get colors with an opacity. This are the same colors used in clinguin
- Example for reified programs
- Link to paper
- Fixed small bugs

Updated imageio package do to deprecation on fps argument

attr(node,a,label,"{name1};{name2};{name3}").
attr(node,a,(label,name1),"Other").
attr(node,a,(label,name2),"Andreas").
attr(node,a,(label,name3),"Mark").

🥇 The first release of clingraph, together with the expected publication in LPNMR 22.
All details can be found in the [documentation](https://clingraph.readthedocs.io/en/latest/).

👀 We hope that this system helps the users debug, analyze, and show off their ASP encodings in a visual fashion.
Please open issues if you see it fit.