Implement improved message loading and display

app/build.gradle.kts

...chku/quasseldroid_ng/persistence/QuasselBacklogStorage.kt

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

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

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

...java/de/kuschku/quasseldroid_ng/ui/chat/MessageAdapter.kt

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

...ava/de/kuschku/quasseldroid_ng/ui/chat/MessageRenderer.kt

...kuschku/quasseldroid_ng/ui/chat/QuasselMessageRenderer.kt

...asseldroid_ng/util/compatibility/AndroidLoggingHandler.kt

...quasseldroid_ng/util/helper/FloatingActionButtonHelper.kt

.../de/kuschku/quasseldroid_ng/util/helper/LiveDataHelper.kt

.../de/kuschku/quasseldroid_ng/util/helper/LruCacheHelper.kt

...ng/util/helper/MaterialContentLoadingProgressBarHelper.kt

...sseldroid_ng/util/ui/MaterialContentLoadingProgressBar.kt

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

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

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

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

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