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* Added default URL to `HTTPClient` class.
* Updated docstrings for `StorageAdapter`, `TinyDBStore` and `Credentials` classes.
* Now returning `state` as `str` instead of `UUID` in `get_authorization_url()` method.
* Now unifying display results for -m/-s/--write. For -m you now need an output specifier (-j/-p) to print the response.
* Added `decode_jwt_payload()` method to allow for extracting/using all JWT fields.
* Added -s option to allow for invocation of setter methods. This allows modifying of credential store fields.
* Added credential setters to allow for modifying credentials.
* Updated examples.
* Switched from using `requests` to `HTTPClient` in `Credentials` class.
* Now checking JWT access_token `exp` to determine if refresh if needed.
* Now generating a new `state` each time `get_authorization_url()` is called.
* Added `__repr__` to `Credentials` class with support for masking secrets.
* Updated -E --ack,nack,poll options usage to be accurate.
* `JOB_FAILED` response in `xpoll()` queryStatus now includes errorCode.