Remove most subnamespaces from core library code

This change removes many subnamespaces that had been used in the core .NET
library for this project.  This should help with type discoverability when
a developer is using IntelliSense.  The only remaining subnamespace is
"Utility" since those classes are not essential to typical usage of the
library.

This change may be reversed in the future if sufficient feedback is
received that subnamespaces are helpful.

Author: daviwil

src/PowerShellEditorServices.Host/MessageLoop.cs

@@ -4,8 +4,6 @@
 //
 
 using Microsoft.PowerShell.EditorServices;
-using Microsoft.PowerShell.EditorServices.Console;
-using Microsoft.PowerShell.EditorServices.Session;
 using Microsoft.PowerShell.EditorServices.Transport.Stdio.Event;
 using Microsoft.PowerShell.EditorServices.Transport.Stdio.Message;
 using Microsoft.PowerShell.EditorServices.Transport.Stdio.Model;

src/PowerShellEditorServices.Host/StdioConsoleHost.cs

@@ -3,7 +3,6 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 //
 
-using Microsoft.PowerShell.EditorServices.Console;
 using Microsoft.PowerShell.EditorServices.Transport.Stdio.Event;
 using Microsoft.PowerShell.EditorServices.Transport.Stdio.Message;
 using Microsoft.PowerShell.EditorServices.Utility;

src/PowerShellEditorServices.Transport.Stdio/Event/DiagnosticEvent.cs

@@ -3,7 +3,6 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 //
 
-using Microsoft.PowerShell.EditorServices.Session;
 using Microsoft.PowerShell.EditorServices.Transport.Stdio.Message;
 using System.Collections.Generic;
 

src/PowerShellEditorServices.Transport.Stdio/Event/ReplPromptChoiceEvent.cs

@@ -3,7 +3,6 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 //
 
-using Microsoft.PowerShell.EditorServices.Console;
 using Microsoft.PowerShell.EditorServices.Transport.Stdio.Message;
 
 namespace Microsoft.PowerShell.EditorServices.Transport.Stdio.Event

src/PowerShellEditorServices.Transport.Stdio/Event/ReplWriteOutputEvent.cs

@@ -3,7 +3,6 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 //
 
-using Microsoft.PowerShell.EditorServices.Console;
 using Microsoft.PowerShell.EditorServices.Transport.Stdio.Message;
 using System;
 

src/PowerShellEditorServices.Transport.Stdio/Message/IMessageProcessor.cs

@@ -3,7 +3,6 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 //
 
-using Microsoft.PowerShell.EditorServices.Session;
 using System.Threading.Tasks;
 
 namespace Microsoft.PowerShell.EditorServices.Transport.Stdio.Message

src/PowerShellEditorServices.Transport.Stdio/Model/Breakpoint.cs

@@ -1,5 +1,4 @@
-using Microsoft.PowerShell.EditorServices.Console;
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;

src/PowerShellEditorServices.Transport.Stdio/Model/Scope.cs

@@ -1,5 +1,4 @@
-using Microsoft.PowerShell.EditorServices.Console;
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;

src/PowerShellEditorServices.Transport.Stdio/Model/StackFrame.cs

@@ -1,6 +1,4 @@
 
-using Microsoft.PowerShell.EditorServices.Console;
-
 namespace Microsoft.PowerShell.EditorServices.Transport.Stdio.Model
 {
     public class StackFrame

src/PowerShellEditorServices.Transport.Stdio/Model/Variable.cs

@@ -1,5 +1,4 @@
 
-using Microsoft.PowerShell.EditorServices.Console;
 namespace Microsoft.PowerShell.EditorServices.Transport.Stdio.Model
 {
     public class Variable