Updated and refactored code

...n/java/de/kuschku/libquassel/syncables/types/Network.java

...de/kuschku/libquassel/syncables/types/SyncableObject.java

...schku/quasseldroid_ng/service/ClientBackgroundThread.java

...va/de/kuschku/quasseldroid_ng/service/QuasselService.java

.../java/de/kuschku/quasseldroid_ng/ui/BufferDrawerItem.java

...java/de/kuschku/quasseldroid_ng/ui/NetworkDrawerItem.java

...G/src/main/java/de/kuschku/quasseldroid_ng/ui/Themes.java

...java/de/kuschku/quasseldroid_ng/ui/chat/ChatActivity.java

...java/de/kuschku/quasseldroid_ng/ui/chat/MainActivity.java

...quasseldroid_ng/ui/chat/chatview/ChatMessageRenderer.java

...chku/quasseldroid_ng/ui/chat/chatview/MessageAdapter.java

...u/quasseldroid_ng/ui/chat/chatview/MessageViewHolder.java

...kuschku/quasseldroid_ng/ui/chat/drawer/BufferWrapper.java

...uschku/quasseldroid_ng/ui/chat/drawer/NetworkWrapper.java

...schku/quasseldroid_ng/ui/coresetup/CoreSetupActivity.java

.../quasseldroid_ng/ui/coresetup/StorageBackendFragment.java

...id_ng/ui/coresetup/StorageBackendRecyclerViewAdapter.java

...a/de/kuschku/quasseldroid_ng/util/CompatibilityUtils.java

...lDroidNG/src/main/java/de/kuschku/util/AndroidAssert.java

...selDroidNG/src/main/java/de/kuschku/util/DrawerUtils.java