* Fix activity output persistence
* Add methods to read activity output
* Add option to ReceiveHttpRequest to parse incoming body to a specific .NET type
* Fix activity service resolution scope issue
* Fix workflow provider base
* Remove unused namespaces
* Fix StringValues serialization and rename WorkflowDefinition to WorkflowDefinitionVersion
* Fix Singleton issue and add support for absolute URL using base URL for background tasks
* Fix persistence and lifetime scope issues
* Fix timer bugs
* Various bug fixes
* Incremental work on signaling
* Incremental work on signal middleware
* Getting somewhere!
* Refactored middelware
* Added BadRequestResult and NotFoundResult