Add a pretty-print function to the Inspector floret

[brototyp]

There are some values of a request or a response that are poorly printed or not visible at all. The scope of this ticket is to add an infrastructure to be able to pretty-print data.

Proposal

• We define a pretty-print ViewController protocol, for example: PrettyPrinter
• The PrettyPrinter defines a static func viewController(for item: Any) -> UIViewController?
• A list of PrettyPrinter classes is defined
• A default mimetype-to-prettyprinter-class mapping is defined
• If a row for a record is tapped
  • If it is the request or response body, the mimetype mapping is used to find a PrettyPrinter-class
  • If no PrettyPrinter is found, or the PrettyPrinter failed to create a ViewController for that item, the user can select from a list of all PrettyPrinter classes or can chose to share this item

[brototyp]

This issue is only partially implemented.