Migrate to V2 of Durable Functions

Merge pull request #19 from bartsokol/durablefunc2

Use latest version of DurableTask library

Eternal orchestrations

Support eternal orchestrations (ContinueAsNew)

Error handling and bug fixes

• Try/with expression is supported
• Try/finally expression is supported
• Activity.all thread unsafety bug fixed

Retries & external events

• Call with retry
• Wait for external events
• Support for Activity.defineTask

0.2.0

Delays, sequential execution of a list of activities, activities returning unit

Initial preview

• Orchestrator computation expression
• Activity type, define, run, call
• Activity.all for Fan-out / Fan-in