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
Update AddressInterface
Update Admin Order edition