Fixed even more memory leaks.

app/src/main/AndroidManifest.xml

.../java/de/kuschku/libquassel/localtypes/BacklogFilter.java

...assel/localtypes/backlogstorage/HybridBacklogStorage.java

...schku/libquassel/syncables/types/impl/BacklogManager.java

...hku/quasseldroid_ng/ui/chat/util/SlidingPanelHandler.java

...oid_ng/ui/coresettings/chatlist/ChatListEditActivity.java

...d_ng/ui/coresettings/identity/IdentityCreateActivity.java

...oid_ng/ui/coresettings/identity/IdentityEditActivity.java

.../coresettings/identity/nick/IdentityNickListActivity.java

...oid_ng/ui/coresettings/network/NetworkCreateActivity.java

...droid_ng/ui/coresettings/network/NetworkEditActivity.java

...oresettings/network/server/NetworkServerEditActivity.java

...oresettings/network/server/NetworkServerListActivity.java

...schku/quasseldroid_ng/ui/setup/AccountSelectActivity.java

...rc/main/java/de/kuschku/util/observables/IObservable.java

...servables/callbacks/wrappers/MultiDrawerItemCallback.java

...ables/callbacks/wrappers/MultiElementCallbackWrapper.java

.../observables/callbacks/wrappers/MultiGeneralCallback.java

...bservables/callbacks/wrappers/MultiUICallbackWrapper.java

...kuschku/util/observables/lists/ObservableElementList.java