Implement topic editing

app/src/main/AndroidManifest.xml

...ain/java/de/kuschku/quasseldroid/dagger/ActivityModule.kt

...n/java/de/kuschku/quasseldroid/ui/chat/ToolbarFragment.kt

...va/de/kuschku/quasseldroid/ui/chat/info/InfoDescriptor.kt

...java/de/kuschku/quasseldroid/ui/chat/info/InfoFragment.kt

...de/kuschku/quasseldroid/ui/chat/input/ChatlineFragment.kt

...de/kuschku/quasseldroid/ui/chat/nicks/NickListFragment.kt

...va/de/kuschku/quasseldroid/ui/chat/topic/TopicActivity.kt

...va/de/kuschku/quasseldroid/ui/chat/topic/TopicFragment.kt

...schku/quasseldroid/ui/chat/topic/TopicFragmentProvider.kt

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

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

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

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