Project updated to vue-cli 3

[lionel-bijaoui]

• Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  Feature

• What is the current behavior? (You can also link to an open issue here)
  Use old version of vue cli

• What is the new behavior (if this is a feature change)?
  Use vue-cli 3

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)
  Not for end user
  For contributors, npm run dev become npm run serve

• Other information:
  New build options common.js and UMD.
  New exported files size:

• full 107 Ko (from 168 Ko)
• core 82 Ko (from 142 Ko)