chore: move hints for retrieving regional codes and leika keys to main section for destination search

- Neuer Routing Client
- Zugriff auf findDestinations und findAreas der Routing API
- Validierung der Signaturen und Claims der Routen-Signaturen
- Handling von detached-signatures (Hinzufügen des detached payloads)

- adds sending of accept- and reject-events
- adds fit-connect problems

- enables end-2-ed encryption by encrypting outside the sdk with the destinations public key 
- send encrypted data to the sdk that handles further submit of the submision data

- Rework der Applicationconfig zu yaml

Feature/15 Java SDK MVP Part I: contains implementations for sending & subscribing to submissions, adds commandline client