Repair OAS apidocs and create handler stubs

C++ handler stubs may be created from the OAS apidocs using

./apidoc-repair.perl aseba-v1.json | ./apidoc-to-stubs.perl > stubs.cpp

The first program removes all examples and moves response descriptions temporarily attached to the schema. The second program maps the corrected endpoints to asebaswitch HTTP handlers. The JSON schema are included as raw strings, with a custom delimiter #json# to avoid conflicts with strings ending in ")".

Since Stoplight “helpfully” substitutes $ref definitions in the OAS documentation published at https://aseba.api-docs.io/v1, the current API definition is included here as aseba-v1.json.