Implement all handshake messages

.gitlab-ci.yml

.../test/kotlin/info/quasseldroid/libquassel/EndToEndTest.kt

.../quasseldroid/libquassel/testutil/QuasselCoreContainer.kt

...quasseldroid/protocol/serializers/HandshakeSerializers.kt

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

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

...id/protocol/serializers/handshake/ClientInitSerializer.kt

...rotocol/serializers/handshake/ClientLoginAckSerializer.kt

...ocol/serializers/handshake/ClientLoginRejectSerializer.kt

...d/protocol/serializers/handshake/ClientLoginSerializer.kt

.../protocol/serializers/handshake/CoreSetupAckSerializer.kt

...protocol/serializers/handshake/CoreSetupDataSerializer.kt

...otocol/serializers/handshake/CoreSetupRejectSerializer.kt

...d/protocol/serializers/handshake/SessionInitSerializer.kt