Implement settings with theming

app/build.gradle.kts

app/src/main/AndroidManifest.xml

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

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

...va/de/kuschku/quasseldroid_ng/ui/chat/NickListFragment.kt

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

...asseldroid_ng/ui/chat/buffers/BufferViewConfigFragment.kt

...uschku/quasseldroid_ng/ui/chat/messages/MessageAdapter.kt

...u/quasseldroid_ng/ui/chat/messages/MessageListFragment.kt

...uasseldroid_ng/ui/chat/messages/QuasselMessageRenderer.kt

...n/java/de/kuschku/quasseldroid_ng/ui/settings/Settings.kt

...e/kuschku/quasseldroid_ng/ui/settings/SettingsActivity.kt

...e/kuschku/quasseldroid_ng/ui/settings/SettingsFragment.kt

...ku/quasseldroid_ng/ui/settings/data/AppearanceSettings.kt

...schku/quasseldroid_ng/ui/settings/data/BacklogSettings.kt

...java/de/kuschku/quasseldroid_ng/ui/setup/SetupActivity.kt

...java/de/kuschku/quasseldroid_ng/ui/setup/SlideFragment.kt

...chku/quasseldroid_ng/util/service/ServiceBoundActivity.kt

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

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