Allow retry of jobs in a phase + multiple fixes

- Updated dependencies
- Stopping Multi Job will also stops all downstream job [JENKINS-24139] [JENKINS-22292] [JENKINS-21879] [JENKINS-20273] [JENKINS-23161]
- Add the possibility to make a step conditional. You can define simple groovy expression for each job. [JENKINS-23968] 
- Fix NPE when a downstream job is unstable [JENKINS-20846] [JENKINS-20557]
- Add retry on a failed job when a user defined condition is met. You can configure the number of retries per job.
- Some fixes to match the new look of Jenkins.
- Rename Delete to "Delete job" because there is confusion between the deletion of parameters and the delete of a job.
- Allow reordering jobs in a phase