Scoped API keys and v2 API

[Goosetaf]

Key features

• Add a large amount of API endpoints for improved data access
• Add scopes to API keys for fine-grained control
• Add API key scope presets
• Add ability to customize scopes in official client APIs
  • Not available in unofficial clients

[Portals]

I think it is best to close this PR for now, because of the rewrite of #973.

But, let's get together and talk about how we can do this with the new kotlin base later!