Implemented rudimentary chatting

app/build.gradle.kts

...rc/main/java/de/kuschku/quasseldroid_ng/QuasseldroidNG.kt

...de/kuschku/quasseldroid_ng/persistence/QuasselDatabase.kt

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

...a/de/kuschku/quasseldroid_ng/ui/chat/BufferListAdapter.kt

...schku/quasseldroid_ng/ui/chat/BufferViewConfigFragment.kt

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

...de/kuschku/quasseldroid_ng/ui/chat/MessageListFragment.kt

app/src/main/res/layout/activity_main.xml

app/src/main/res/layout/content_main.xml

app/src/main/res/layout/content_messages.xml

app/src/main/res/menu/main.xml

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

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

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

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

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

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

...e/kuschku/libquassel/util/compatibility/LoggingHandler.kt