* Incremental fixes
* Fix base assignment of async delegate block reference
* Reuse existing memory blocks
* Remove PlaybackStarted child activity
The PlaybackStarted property is unnecessary, since the PlayAudio activity already completes right after playback has started.
* Add GetCallStatus API method
* Prevent variables on composite activities to be overwritten during deserialization
* Remove unnecessary variable declarations
Activity variables will be declared automatically during activity invocation.
* Add XML comments
* Remove unused references arg
* Streamline variable identity assignment
* Fix composite early exit completion
* Move identity assignment to workflow definition service
* Stash
* Incremental work on persistent variables
* Move variable management to central service
* Implement variable cleanup upon composite activity completion
* Update job activities handler
Looks like somehow implicit global usings have been removed or disabled 🤔
* Implement background activity execution
* Checkbox UI improvements
* Implement Task configuration for asynchronous execution
* Make job queue hosted service process jobs in parallel
* Make job worker count configurable
* Incremental work on custom activities
* Incremental work on refactoring versioned entities
* Add ActivityDefinition infrastructure
* Incremental work on activity definition manager
* Incremental work on API endpoints
* Refactored flowchart component to include hierarchical nav
* Incremental work on modularization of designer component
* Restructuring into modules
* Rename CustomActivities module
* Apply security
* Fix activity definition GET endpoint
* Incremental work on activity definition provider
* Incremental work on activity definition execution
* Update ActivityDefinitionMaterializer.cs
* Update ActivityDefinitionActivityProvider.cs
* Add activity definition referenced version update handler
* Maintain position of not found activity
* Fix prefix naming
