Theobald Server 3.8

• Added common base for web worker, HTTP server backend and running extractions.
• An accompanying framework for writing tests for this stack was added as well.
• Fixed some authentication and authorization issues in the new web server backend.
• Fixed a bug in the HTTP server causing it to carry state to a new request if the previous one ran into an error.
• Added service and source level support for the new runtime and web server.
• Refactored the handling of parameters for running extractions.