Handle pipelines, triggers and tasks ID changes

[lucafaggianelli]

If a user wants to change just the name it's not a problem, but if an ID is changed it's a problem.

Run page

With today's frontend page structure the run pages don't work in case of renaming as the URL is /pipeline/pipeline_id/triggers/trigger_id/runs/run_id but this doesn't make any sense as the run ID is independent and the info can be still found in the DB so if the page in the frontend changes to /runs/<id> it's a already a huge gain!

Rename feature

a rename feature could be added to rename things in the DB, don't know if this is worth though