Provide a CLI tool to publish on the Dolistore

[rdoursenaud]

Rationale:
Publishing on the Dolistore can be quite time consuming and error-prone.
All the required informations can be provided by files (images, texts, metadata…).
Managing these in the repository makes sense and would allow using translation tools to manage the localization.

Here's a rundown of what I think is required to achieve this goal:

• Defining a common format.
  As a basis, here's what I'm using at the moment:
  https://github.com/GPCsolutions/dolibarr-module-template/tree/master/dev/dolistore
  Nota: Markdown support besides HTML would be great!
• Server side API
  • Handle authentication (OAuth2? Prestashop? OpenSSH?)
  • Receive files
  • Publish
• The CLI script itself
  Ideally written in PHP to allow easy hacking within the project.
  • Authentication
  • File upload
  • Publication

Another approach would be to provide a GIT service like the AUR.
This would not require yet another tool and handle authentication for us using SSH.
A server-side post-receive hook could handle the format verification and the publication.