Remove unused using directives

Author: IvenBach

Rubberduck.Core/UI/UnitTesting/TestExplorerViewModel.cs

@@ -4,16 +4,13 @@
 using System.ComponentModel;
 using System.Globalization;
 using System.Linq;
-using System.Windows.Annotations;
 using System.Windows.Data;
 using NLog;
 using Rubberduck.Common;
 using Rubberduck.Interaction.Navigation;
-using Rubberduck.Parsing;
 using Rubberduck.Parsing.Annotations;
 using Rubberduck.Parsing.Rewriter;
 using Rubberduck.Parsing.VBA;
-using Rubberduck.Resources;
 using Rubberduck.Settings;
 using Rubberduck.SettingsProvider;
 using Rubberduck.UI.Command;