Prepare for adding new chat archive screen

app/src/main/AndroidManifest.xml

...e/kuschku/quasseldroid/ui/chat/archive/ArchiveActivity.kt

...e/kuschku/quasseldroid/ui/chat/archive/ArchiveFragment.kt

...u/quasseldroid/ui/chat/archive/ArchiveFragmentProvider.kt

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

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

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

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

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

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

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