global component data

[MiniXC]

Allow component data to span across multiple pages. This adds a new folder to frix's structure globals, contain simple json files that can be injected into content json files using the following syntax.

"&globals": {
    "navbar": ["header", "navigation"],
    "title": []
  }

[bminixhofer]

TODO: write tests for this.

[MiniXC]

I think we have to somehow change this to set the globals directly from the template. Something like this?

<title text-content="title" global="title">

This makes more sense than referencing the global from the json itself. There are no globals that aren't global. But with the current solution, globals can or cannot be used on a json-to-json basis.