* Implement Alteration types and engine
* Implement Alteration APIs
* Refactor activity work item with support for activity input
* Serialize scheduled activities as part of workflow state
* Add signal to schedule child activity
* Implement stores for plans and jobs
* Add EF Core provider
* Add Retry endpoint
* Keep root context as always active. The root context is the workflow execution context and contains persistent variable state
* Regenerate EF Core migrations
* Handle orphaned activity execution contexts
* Refactor workflow execution factory
* Enable configuring Jint from Program
* Update ModifyVariable alteration with support for type deserialization
* Use ShortGuid for identity
* Cleanup WorkflowServer host
* Incremental work on samples
* Rename HTTP middleware and update samples
* Rename HTTP Activities to Workflows
* Automatically register core activities when adding Elsa
* Fix feature registration bug
* Add default auth feature
* Make activity serializer more flexible
* Bump designer version
* Add workflow server + designer samples
* Simplify EntityFrameworkCore projects
* Update solution
* Add Sqlite package references to ensure the correct version is used
* Update sample project with EF Core
* Update EF extensions
* Add server + designer sample project
* Cleanup AllInOne project and add some XML comments
* Rename ci.yml and add CI for Docker file
