Removed constness from most of the handeled packets in AbstractARAClient.

This is neseccary if we want to avoid using clones of the packets
The PacketTrap does no longer store copies of the original packets
AbstractARAClient does no longer clone apacket before it is sent
The AbstractARAClient is now responsible for deleting packets it gets via sendPacket(..)
The packets are now also correctly deleted in receivePacket(..)
Packets are no longer cloned before each broadcast
Wrote a test to verify that packet is not deleted if it shall be send to the system
Fixed Bug in OMNeT++ simulations
The OMNeT++ packets are now correctly encapsulated