update to the latest oatpp API.

Merge pull request oatpp#39 from oben01/Hotfix/RFC3986

oatpp#38 change enum generated name to be compliante with RFC3986

Merge pull request oatpp#30 from oatpp/v_1.2.0

Update to the oatpp API 1.2.0. Add type interpretation feature.

Update swagger-ui resources.

Merge pull request oatpp#17 from oatpp/add_oatpp_unsigned_types

Add oatpp unsigned types

Update to the oatpp 0.19.12 API.

Update oatpp version to 0.19.11.

Increase oatpp version to '0.19.10'

Version. Increase to '0.19.9'.

Increase oatpp version to 0.19.8