Adding sr.strings file and removing hard-coded strings (#52)

* Strings sweep for connection service

* String sweep for credentials service

* String sweep for hosting

* String sweep for query execution service

* String sweep for Workspace service

* Renaming utility namespace to match standards

Renaming Microsoft.SqlTools.EditorServices.Utility to
Microsoft.SqlTools.ServiceLayer.Utility to match the naming changes done a
while back. Also renaming them on the files that use them

* Namespace change on reliable connection

* Adding the new resx and designer files

* Final bug fixes for srgen

Fixing flakey moq package name

* Removing todo as per @kevcunnane

* Adding using statements as per @llali's comment

* Fixing issues from broken unit tests

Note: This feature contains changes that will break the contract for
saving as CSV and JSON. On success, null is returned as a message instead
of "Success". Changes will be made to the vscode component to handle this
change.

src/Microsoft.SqlTools.ServiceLayer/Workspace/Contracts/BufferRange.cs

@@ -57,11 +57,8 @@ namespace Microsoft.SqlTools.ServiceLayer.Workspace.Contracts
         {
             if (start > end)
             {
-                throw new ArgumentException(
-                    string.Format(
-                        "Start position ({0}, {1}) must come before or be equal to the end position ({2}, {3}).",
-                        start.Line, start.Column,
-                        end.Line, end.Column));
+                throw new ArgumentException(SR.WorkspaceServiceBufferPositionOutOfOrder(start.Line, start.Column,
+                    end.Line, end.Column));
             }
 
             this.Start = start;