* Fixed Yaml serialisation/deserialisation
Copied json serializer settings from JsonTokenFormatter, apart from CamelCasePropertyNamesContractResolver, as the yaml already had the correct case, and this would cause activity state (which has PascalCasing) to be camelCased too
* Updated YamlDotNet.Standard to YamlDotNet
Switched package as YamlDotNet.Standard has been unlisted on Nuget
* 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
* Removed cruft
* Consolidated activity driver with activity
* Incremental work on serialization
* Incremental work on serialization
* WIP
* Incremental work on strongly typed defined workflows
* Removed old samples and added new ones
* Updated primitives and improved workflow builder API
* WIP (broken)
* Coded workflow API improvements
* Fixed Email and Http libraries
* Fixed start activity issue