Prepare for implementing common syncable objects

...tjanne/libquassel/generator/visitors/RpcModelProcessor.kt

libquassel-protocol/build.gradle.kts

.../libquassel/protocol/exceptions/UnknownMethodException.kt

...ibquassel/protocol/exceptions/WrongObjectTypeException.kt

...e/justjanne/libquassel/protocol/syncables/AliasManager.kt

.../justjanne/libquassel/protocol/syncables/ObjectHandler.kt

...lin/de/justjanne/libquassel/protocol/syncables/Session.kt

...justjanne/libquassel/protocol/syncables/SyncableObject.kt

...e/justjanne/libquassel/protocol/syncables/SyncableStub.kt

...ustjanne/libquassel/protocol/syncables/invoker/Invoker.kt

...e/libquassel/protocol/syncables/stubs/AliasManagerStub.kt

...libquassel/protocol/syncables/stubs/BacklogManagerStub.kt

...e/libquassel/protocol/syncables/stubs/BufferSyncerStub.kt

...bquassel/protocol/syncables/stubs/BufferViewConfigStub.kt

...quassel/protocol/syncables/stubs/BufferViewManagerStub.kt

...ne/libquassel/protocol/syncables/stubs/CertManagerStub.kt

...janne/libquassel/protocol/syncables/stubs/CoreInfoStub.kt

...anne/libquassel/protocol/syncables/stubs/DccConfigStub.kt

...ssel/protocol/syncables/stubs/HighlightRuleManagerStub.kt

...janne/libquassel/protocol/syncables/stubs/IdentityStub.kt