* Initial version of c# expressions
* Add support for strongly-typed workflow variable accessors
* Fix type casting
* Rename c# to C# in XML comments
* Rename Globals.Context to ExecutionContext and Variables to Context
* Move RunJavaScript activity to Elsa.JavaScript
* Add RunCSharp activity
* Add CSharpOptions
* Add common workflow properties and methods
* Incremental work on Telnyx integration
* Incremental port of Telnyx activities
* Fix polymorphic JSON serialization for webhook data
* Fix IsFirstPass logic
* Fix trigger base to prevent activity auto completion
* Temporarily disable persistent snapshotting provider for testing
* Fix namespaces
* Add method to register activities in bulk using marker type
* Fix Telnyx refit client setup
* Register all Telnyx activities by default
* Incremental work on webhook driven resumption and correlation
* Incremental work on post-bookmark signaling
* Fix bookmark resolution
* Include correlation ID with bookmark
* Fix Telnyx resumption input
* Replace bookmark persisted signal with handler
* Fix SpeakText completion
* Add flow outcomes to SpeakText activity
* Update GatherUsingSpeak and GatherUsingaudio
* Refactor "is first pass" concept
* Fix WebhookEvent activity
* Add HTTP absolute URL provider
* Formatting and small changes
* Various API enhancements