➕ Add a plugin to display the next zenika formation.

[maeln]

This PR add a submodule for the plugin zenika-formations, which display a list, and optionally details, about the next formations at a Zenika agency.

This PR is related to the issue #293 .
Here is the configuration of the plugins:

{
      "name": "Formation Zenika",
      "description": "Display a list of the next Zenika formation.",
      "eltName": "marcel-plugin-zenika-formations",
      "icon": "picture_in_picture_alt",
      "frontend": {
        "props": [
          {
            "name": "agency",
            "description": "Name of the Zenika agency.",
            "type": "string",
            "value": "nantes"
          },
          {
            "name": "titleMessage",
            "description": "Title message. If it contains {agency}, it will be replaced by the agency name.",
            "type": "string",
            "value": "Next formations in {agency}"
          },
          {
            "name": "displayTime",
            "description": "Number of seconds before switching selection.",
            "type": "float",
            "value": 10.0
          },
          {
            "name": "locale",
            "description": "Langage to use for the date.",
            "type": "string",
            "value": "en"
          },
          {
            "name": "dualpane",
            "description": "If the display should be single pane or dual pane.",
            "type": "bool",
            "value": true
          },
          {
            "name": "selectedColor",
            "description": "The color that will be used to highlight the currently displayed formation.",
            "type": "string",
            "value": "rgba(222, 33, 33, 0.85)"
          },
          {
            "name": "headerColor",
            "description": "The color of the headers.",
            "type": "string",
            "value": "rgba(222, 33, 33, 0.85)"
          }
        ]
      }
    }

[nlepage]

@EmrysMyrddin we need to stop using submodules
Is it normal to have tinycolor.js and moment.js commited in the subrepository ?!
Why is there an identical marcel.js commited in every (not polymer) sub repository ?!

@maeln Nice work 👍 don't worry I'm just asking questions

[maeln]

I do agree that putting the dependencies straight in the plugin is not the proper way to do it.
Is there a "official" way to handle the dependencies for MARCEL's plugins (like npm or similar) ?
We should also definitely have way to share marcel.js between repo, since it seems we are going to use it everywhere.

[EmrysMyrddin]

@nlepage Yes, we have to find an other way to handle plugins. We are using theim beacause we don't have a "plugin market place" for now. so having plugins in as submodules allow us to automaticaly update them with CricleCI.

For the marcel.js, We have to make a seperate library, but we have to think about the way we will do this. I have thought of an npm package, but I also would like to allow users to use this lib as a simple <script> import.

[nlepage]

OK let's talk about this in slack.