menu (TransferMenu): UI improvments: - a white background is now used - ToggleButton have been replaced by SymbolButtonLabel - transfer info message now displays with emphasis if the file will be encrypted or not, and explain when the file goes to the server - various padding/spacing/color adjustments

<intent-filter>
    <action android:name="android.intent.action.SEND" />
    <category android:name="android.intent.category.DEFAULT" />
    <data android:mimeType="*/*" />
</intent-filter>