- Fixed #62: Refactor BasePdpEngine - Move the standardEnvironmentAttribute* code (providing current-time/dateTime/date attributes not present in the request) to dedicated AttributeProvider -> new PDP XSD and new built-in AttributeProvider: `StandardEnvironmentAttributeProvider` class
- authzforce-ce-parent upgraded to 8.1.0
- Authzfoce-ce-core-pdp-api upgraded to 19.0.0: applied API changes:
### Changed
- AttributeProvider interface removed, existing NamedAttributeProvider used instead
- `authzforce-ce-parent` version: 8.1.0
- Improved support of Multiple Decision Profile in the `PdpEngine` interface and the following types of PDP extensions:  Combining Algorithm, Function, Attribute Provider, Policy Provider. The corresponding interfaces (`CombiningAlg`...) have changed: certain of their methods - called during request evaluation - now take a new `Optional<EvaluationContext>` parameter which is used to pass the MDP evaluation context (MDP = Multiple Decision Profile) which is an evaluation context shared...