Remove LoggerAwareTrait

[hochleitner]

After reading https://peakd.com/hive-168588/@crell/using-psr-3-placeholders-properly, it is clear that the Router class should not use LoggerAwareTrait to enable a setLogger() function. Instead, dependency injection should be used, and a LoggerInterface instance should be injectable by the constructor.

Usually, this kind of behavior would be handled by a DI container, but since fhooe/router will most likely always be used without one (to keep it simple), an optional parameter in the constructor should suffice.