Fix Designer on unreleased target platforms

Studio Designer is only partially usable on unreleased target platforms (ex: 10.10) due to failures loading some files (like the hints json file).
This is due to the fact that the jar being generated for the nuxeo-view-designer module contains a 10.10 data directory that only contains some of the files that should be made available (probably due to the symlink from 10.10 to 10.3).

The files contained are:

• catalog-packages.json
• catalog.json
• element-preview-import.html
• nuxeo-web-ui-bundle.html
• registries.json

The missing directories are:

• data
• hints
• nuxeo-web-ui
• templates
• themes
• ui