Composerify

[MaximeCulea]

Improve plugin integration by adding composer.json file.

If the custom settings.api by Tareq was blocking it, now it can be included in composer's requirements.

[MaximeCulea]

As the zip can differ from the repo package, Tareq's Setting API could be deleted and integrated only by Composer.
This means that each release zip must contain full package for download purpose without composer dependencies. Either, people using composer could only use composer install to get the plugin and needed requirements.

/!\ Btw, as Tareq's setting API has been updated, don't forget to use the new one. /!\

So I update the todo list :

• Add composer.json
• Update Setting API (1.2)
• Refactor display with new API
• Full composer integration/handle release packages

[MaximeCulea]

As API has changed, It would be preferable to refactor the way to display current sections into pages, then each notification into a section as the setting API works.