Summary

Main idea was to add a command to list all registered routes, to make the annotation more usable.
But when doing so I noticed the Router is broken as retrieving individual collections of routes was broken,
so this also contains a fix for it:

• Add routes to individual collections for each app
  and then merge them for the root collection holding all routes for the
  URL generator.
• Short cut route loading with already loaded apps
• Simplify active collection handling
• Remove deprecated OC_App usage
• Fully type Router methods

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)