Pokitdok

Support new APIs:

https://platform.pokitdok.com/documentation/v4/claims-convert

https://platform.pokitdok.com/documentation/v4/icd-convert

keep oauthlib version below 0.7.0 to avoid Warnings when fetching a token for scope protected APIs

- OAuth2 authorization code support
- example authorization Flask template
- scheduling API support
- Auto token refresh support
- MPC API support
- provider data sampler script

Adds support for the new plans API