Attempt to fix memory leaks

...de/kuschku/quasseldroid/service/AndroidHeartBeatRunner.kt

...main/java/de/kuschku/quasseldroid/service/AsyncBackend.kt

...in/java/de/kuschku/quasseldroid/service/QuasselService.kt

...kuschku/quasseldroid/util/service/ServiceBoundActivity.kt

...n/java/de/kuschku/libquassel/connection/CoreConnection.kt

...de/kuschku/libquassel/quassel/syncables/BacklogManager.kt

...a/de/kuschku/libquassel/quassel/syncables/BufferSyncer.kt

...kuschku/libquassel/quassel/syncables/BufferViewManager.kt

...kuschku/libquassel/quassel/syncables/IgnoreListManager.kt

...ava/de/kuschku/libquassel/quassel/syncables/RpcHandler.kt

...de/kuschku/libquassel/quassel/syncables/SyncableObject.kt

...ibquassel/quassel/syncables/interfaces/ISyncableObject.kt

...main/java/de/kuschku/libquassel/session/BacklogStorage.kt

...ain/java/de/kuschku/libquassel/session/HeartBeatRunner.kt

...java/de/kuschku/libquassel/session/JavaHeartBeatRunner.kt

.../main/java/de/kuschku/libquassel/session/ObjectStorage.kt

...ain/java/de/kuschku/libquassel/session/ProtocolHandler.kt

lib/src/main/java/de/kuschku/libquassel/session/Session.kt

...main/java/de/kuschku/libquassel/session/SessionManager.kt

...kuschku/quasseldroid/persistence/QuasselBacklogStorage.kt