Implement multi-message copy and share

app/build.gradle.kts

...kuschku/quasseldroid/ui/chat/buffers/BufferListAdapter.kt

.../quasseldroid/ui/chat/buffers/BufferViewConfigFragment.kt

...e/kuschku/quasseldroid/ui/chat/messages/MessageAdapter.kt

...chku/quasseldroid/ui/chat/messages/MessageListFragment.kt

.../kuschku/quasseldroid/ui/chat/messages/MessageRenderer.kt

...u/quasseldroid/ui/chat/messages/QuasselMessageRenderer.kt

...quasseldroid/ui/chat/messages/QuasselMessageViewHolder.kt

...de/kuschku/quasseldroid/ui/settings/crash/CrashAdapter.kt

...u/quasseldroid/ui/settings/crash/CrashSettingsFragment.kt

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

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

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

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

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

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

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

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

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

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