Remove unnecessary usings

Stylet/BindableCollection.cs

@@ -1,5 +1,4 @@
-using System;
+using System.Collections.Generic;
-using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Collections.Specialized;
 using System.ComponentModel;

Stylet/Bootstrapper.cs

@@ -2,7 +2,6 @@
 using System;
 using System.Collections.Generic;
 using System.Reflection;
-using System.Windows;
 
 namespace Stylet
 {

Stylet/Conductor.cs

@@ -1,5 +1,4 @@
-using System;
+using System.Threading.Tasks;
-using System.Threading.Tasks;
 
 namespace Stylet
 {

Stylet/ConductorAllActive.cs

@@ -1,5 +1,4 @@
-using System;
+using System.Collections;
-using System.Collections;
 using System.Collections.Generic;
 using System.Collections.Specialized;
 using System.Linq;

Stylet/ConductorBase.cs

@@ -1,5 +1,4 @@
-using System;
+using System.Collections.Generic;
-using System.Collections.Generic;
 using System.Diagnostics;
 using System.Linq;
 using System.Threading.Tasks;

Stylet/ConductorBaseWithActiveItem.cs

@@ -1,5 +1,4 @@
-using System;
+using System.Collections.Generic;
-using System.Collections.Generic;
 
 namespace Stylet
 {

Stylet/ConductorNavigating.cs

@@ -1,5 +1,4 @@
-using System;
+using System.Collections.Generic;
-using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 

Stylet/ConductorOneActive.cs

@@ -1,5 +1,4 @@
-using System;
+using System.Collections.Generic;
-using System.Collections.Generic;
 using System.Collections.Specialized;
 using System.Linq;
 using System.Threading.Tasks;

Stylet/IBootstrapper.cs

@@ -1,5 +1,4 @@
-using System;
+using System.Windows;
-using System.Windows;
 
 namespace Stylet
 {

Stylet/IConductor.cs

@@ -1,5 +1,4 @@
-using System;
+using System.Collections.Generic;
-using System.Collections.Generic;
 
 namespace Stylet
 {

Stylet/INotifyCollectionChanging.cs

@@ -1,5 +1,4 @@
-using System;
+using System.Collections.Specialized;
-using System.Collections.Specialized;
 
 namespace Stylet
 {

Stylet/IValidationAdapter.cs

@@ -1,5 +1,4 @@
-using System;
+using System.Collections.Generic;
-using System.Collections.Generic;
 using System.Threading.Tasks;
 
 namespace Stylet

Stylet/PropertyChangedBase.cs

@@ -1,7 +1,6 @@
 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
-using System.Diagnostics.CodeAnalysis;
 using System.Linq.Expressions;
 using System.Runtime.CompilerServices;
 

Stylet/ScreenExtensions.cs

@@ -1,5 +1,4 @@
 using System;
-using System.Windows;
 
 namespace Stylet
 {

Stylet/StyletConductorExtensions.cs

@@ -1,5 +1,4 @@
-using System;
+using System.Collections;
-using System.Collections;
 using System.Linq;
 
 namespace Stylet

Stylet/StyletIoC/IContainer.cs

@@ -1,6 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.Linq;
 
 namespace StyletIoC
 {

Stylet/StyletIoC/IInjectionAware.cs

@@ -1,6 +1,4 @@
-using System;
+namespace StyletIoC
-
-namespace StyletIoC
 {
     /// <summary>
     /// Interface to be implemented by objects if they want to be notified when property injection has occurred

Stylet/StyletIoC/StyletIoCBuilder.cs

@@ -1,12 +1,10 @@
 using StyletIoC.Creation;
 using StyletIoC.Internal;
 using StyletIoC.Internal.Builders;
-using StyletIoC.Internal.Registrations;
 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Reflection;
-using System.Runtime.CompilerServices;
 
 namespace StyletIoC
 {

Stylet/StyletIoC/StyletIoCContainer.cs

@@ -1,6 +1,4 @@
-using System;
+namespace StyletIoC
-
-namespace StyletIoC
 {
     /// <summary>
     /// Lightweight, very fast IoC container

Stylet/WindowManager.cs

@@ -2,7 +2,6 @@
 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
-using System.Linq;
 using System.Windows;
 using System.Windows.Data;
 

Stylet/Xaml/View.cs

@@ -1,5 +1,4 @@
 using System;
-using System.Linq;
 using System.Windows;
 using System.Windows.Data;
 using System.Windows.Markup;

Stylet/Xaml/ViewModelExtension.cs

@@ -1,10 +1,5 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 using System.Windows;
-using System.Windows.Data;
 using System.Windows.Markup;
 
 namespace Stylet.Xaml