Fastapi-code-generator

- support summary [63]

- Support python39 [59]
- Support python37 [58]
- Support remote ref on parameters, requestBodies and responses [57]
- Use re.compiled object [50] by ioggstream

Thanks to ioggstream

- support $ref paramter [49]

- support application json variant [47 ]

- improve model management [45]
- add info parser [42] by akuma5157
- support $ref in response [29]

Thanks to akuma5157

- Yaml is a superset of json. [23] by ioggstream

Thanks to ioggstream