Improve Engine Deployments Experience

[barmac]

This is a bulk issue for all issues related to the deployment tool.

• Deploy dialog should be closable without input First time trying to close "Deploy Diagram" dialog leads to error "Deployment name must not be void." #1405
• Pre-fill deployment endpoint with default input on first deploy Pre-fill deployment dialog details #1441
• Background check if the server is reachable Check in the background if the deployment server is reachable #1444
• Improve display of deployment parse errors Improve display of deployment parse errors #1426
• Deploy and notify user outside of deploy dialog Deployment popup should close automatically after successful deployment #839
• Remember deployment details with diagram Remember deployment details with diagram #1066

descoped for now

• Remember authentication details with endpoint configuration Remember authentication details with endpoint configuration #1067
• Make re-deploy with same configuration the primary deploy button action Make re-deploy with current config the primary deploy button action #1440
• Store and use multiple endpoints Be able to create re-usable deploy configurations #804

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Cf. UI sketches for details on the complete picture.

[nikku]

@barmac @volkergersabeck I've prepared and linked the UI sketches to this issue.