[!!!][~TASK] Improve API of Signal Slot Dispatcher
This changes the signature of the Dispatcher::connect() method.
Previously the signal's method name was specified, now a signal name
is expected instead. The difference is that between "emitFoo" and "foo".
Additionally this drops support for the SignalSlots.yaml configuration.
Instead of that configuration file, the package bootstrap should be used
for definition of signal-slot connections.