Autotests:

* Add autotest for registering multiple apps
* Add autotest for registering CTXs
* Add autoetst for registering and App/CTX twice

API:

* The User should be able to select which Socket to be used, or to log to a file
* Add a way to use the DltRegistration messageHandle only as a proxy and also activate the normal stdout logging
* Add API for registering injection messages and provide a signal when the messages arrive
* Look into reusing QLoggingCategory::defaultCategory instead of the FALLBACK_CATEGORY
* Extend macro to also support the new Q_LOGGING_CATEGORY macro with msgType