profile: allow user to use an avatar when creating first account

- adds camera capture UI to wizard.
- stores avatar image to disk and logs a reference in the user's preferences.
- loads avatar from disk when loading preferences at application start.
- removes avatar icons from account list.
- removes camera capture UI from add accounts widget

Change-Id: Id3467a7214c2f52ec70690df360ce9e3a0cb2df2
Tuleap: #989
diff --git a/Wizard.xaml.h b/Wizard.xaml.h
index 70792c5..7c146a0 100644
--- a/Wizard.xaml.h
+++ b/Wizard.xaml.h
@@ -15,6 +15,7 @@
     void _createAccountYes__Click(Platform::Object^ sender, Windows::UI::Xaml::RoutedEventArgs^ e);

     void _showCreateAccountMenuBtn__Click(Platform::Object^ sender, Windows::UI::Xaml::RoutedEventArgs^ e);

     void _showAddAccountMenuBtn__Click(Platform::Object^ sender, Windows::UI::Xaml::RoutedEventArgs^ e);

+    void _avatarWebcamCaptureBtn__Click(Platform::Object^ sender, Windows::UI::Xaml::RoutedEventArgs^ e);

 };

 

 }