Fixed bugs and issues, implemented first working version

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

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

...uschku/quasseldroid_ng/ui/chat/fragment/ChatFragment.java

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

.../java/de/kuschku/quasseldroid_ng/ui/chat/util/Status.java

app/src/main/res/values/themes.xml