Servicehost cleanup (#1)

Merge some code clean ups.  Find+Replace 'PowerShell' with 'SQL Tools'.
Enable logger in ServiceHost project.

ServiceHost/Workspace/FilePosition.cs

@@ -3,7 +3,7 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 //
 
-namespace Microsoft.PowerShell.EditorServices
+namespace Microsoft.SqlTools.EditorServices
 {
     /// <summary>
     /// Provides details and operations for a buffer position in a