* Fixing ApplicationData.DataChanged handler, so it can reload roaming settings properly and display a MessageDialog in Debug version.
* Reverting the change that prevents ListView to be re-render when questions list hasn't changed.
Enabling "mark as read" for selected items.
Removing unimplemented buttons.
Little changes to export/import settings.

Settings internally are saved at
C:\Users\Gilberto\AppData\Local\Packages\1588kiewic.com.Questions_3sn31agg1a2hg\Settings\settings.dat
and can be opened using regedit > "Load Hive...".