Further cleanup and tests

...ku/libquassel/protocol/messages/handshake/CoreSetupAck.kt

...u/libquassel/protocol/messages/handshake/CoreSetupData.kt

...libquassel/protocol/messages/handshake/CoreSetupReject.kt

...hku/libquassel/protocol/messages/handshake/SessionInit.kt

...u/libquassel/protocol/serializers/HandshakeSerializers.kt

...ssel/protocol/serializers/NoSerializerForTypeException.kt

.../kuschku/libquassel/protocol/serializers/QtSerializers.kt

...hku/libquassel/protocol/serializers/QuasselSerializers.kt

...protocol/serializers/handshake/ClientInitAckSerializer.kt

...tocol/serializers/handshake/ClientInitRejectSerializer.kt

...el/protocol/serializers/handshake/ClientInitSerializer.kt

...sel/protocol/serializers/handshake/HandshakeSerializer.kt

...el/protocol/serializers/primitive/ByteBufferSerializer.kt

...bquassel/protocol/serializers/primitive/DateSerializer.kt

.../protocol/serializers/primitive/HandshakeMapSerializer.kt

...el/protocol/serializers/primitive/IdentityIdSerializer.kt

...sel/protocol/serializers/primitive/NetworkIdSerializer.kt

...assel/protocol/serializers/primitive/PeerPtrSerializer.kt

...l/protocol/serializers/primitive/QStringListSerializer.kt

.../protocol/serializers/primitive/QVariantListSerializer.kt