Merge pull request #815 from loiccouturier/master

Somes Fix and Enhance document picker
Remove tip zone
In webStoreSelector, if there is only one webStore and one billingArea, update session if different.
[REFACTOR] Remove UpdateCartLine action and use UpdateCart instead.
[FIX] Vertical alignment in document URL panel.
Small fixes on breadcrumb
Fix local copies and new documents
Merge pull request #816 from intportg/dev

Fixes and refactoring
Core subtree split
subtree composer update
subtree composer update
Prepare subtree split
Update main composer.json file
Update sub composer files
Move core package to PSR-4 autoloading
Move most composer psr-0 autoloading to psr-4
Self update composer
Merge pull request #817 from franckstauffer/fix

Move most composer psr-0 autoloading to psr-4
Fix picker selection
Update order editor