This reverts commit 3fb8ab4d.

Instead of throwing exceptions, which will be logged by the system,
return usable status codes and messages.
Will return a valid JSON with a Message key in that Case.

Exceptions, which do not carry codes of 401, 403 or 404 are not
catched for now, stopping us to return too usefull informations

[TASK] Use Injections for everything, inject AuthenticationServiceInterface into Middlewares and AuthenticationServices, remove extConf variable since the the AuthenticationService to be used is now configured in the Services.yaml, edit README.md

[TASK] Restructure Middlewares, add AbstractRestMiddleware which has all prerequisites for the other REST-Middlewares to work

[TASK] Split middleware into two (Authenticator/Dispatcher), introduce AuthenticationController for bearer token allocation, use loggerservice for logging