Resolve "Banner: Add from RuntimeConfig"

Closes #942 (closed)

This MR depends on !811 and !806. That's where the majority of the changes come from! The actual changes in this MR should only be a few.

In order to see a banner add MockRccPublicRuntimeConfigModule to features.ts. Or create a config.json at your local build, e.g. dist/app/hcp/local/config.json containing this data:

{
  "banner":{
    "color":"secondary",
    "markdown":{
      "translations":{
        "de": "__fett__ normal<br>Zeilenumbruch",
        "en": "__bold__ normal<br>line break"
      }
    }
  }
}