* Fix sample Elsa.Samples.FileBasedWorkflow
* Separate Quartz from Elsa.Activities.Timers
* Incremental work on Hangfire integration
* Incremental work on Hangfire integration
* Incremental work on Hangfire integration
* Incremental work on Hangfire integration
* Add CancelTimer
* ToCronExpression for Duration
* Removed SweepInterval
* Synchronize access to scheduler
* Refactoring RunHangfireWorkflowJob
* Optimize timer activities to always execute when target time stamp lies in past
* Refactoring TimersOptionsExtensions
* Added common.props and configureawait.props
* Rename CancelTimer to ClearTimer
* Wrong parameter name in comment
* Refactoring TimerConsts and RunQuartzWorkflowJob
Co-authored-by: Rafael Carnucci <rafael.carnucci@icn.de>
Co-authored-by: Sipke Schoorstra <sipkeschoorstra@outlook.com>
