v2.0.0[deprecated]

[MBueschelberger]

• [x] introduce new simplified mapping file schema
• [x] introduce qudt and csvw for table annotation
• [x] introduce pydantic into the package
• [x] make method graph optional
• [x] introduce new standard method graph using provo
• [x] general package maintainance
• [x] refactor modules
• [x] add utility to read qudt-mapping from unit-symbols
• [x] add utility to generate subgraph for quantity description using qudt
• [x] support json files as input for mapping files
• [x] drop unneeded intermediate file outputs
• [x] update excel parser
• [x] add json parser
• [ ] update documentation

[yoavnash]

I see it's still marked as draft so I'm waiting with my review for now.