Can be found in commit ca238e6.

Converts an async interface class to a blocking one by including a special class base. Only implemented for methods but property support can be easily added.

Also propagates the type information. The new blocking functions will take the exact same argument types and return the same types. This is implemented using ParamSpec so it is has to wait until the Jedi auto completions adds ParamSpec support.

The idea is to have less code duplication between async and blocking code. With such adapter only the async interfaces would have to be implemented.