Add User Web API
Add product list Infinite Scroll.
Add User Web API
Fix back office IE9 error
Merge pull request #1097 from inthause/APIWeb

Add User Web API
Fixes: print template, shipment stock and return request form.
Migrate order list and detail blocks.
In product data, return the full price data for variant products.
Add a specific modeThumbnail image format for shipping modes and payment connectors in the order process.
Add some block twig tags on some directive templates.
Extract 2 directives from cart line to use them in returns too.
Add new interstitial block.
Product detail update.
In the return-list block, if there is no return, add a message.
Allow to disable precisions and attachedFile fields for some reasons in product returns.
Fix reinsurance empty test.