Adding decoding of multipart identifiers, default schema workaround (#295)

This change adds a couple things

_Multipart Identifier Decoding_
The ability to decode a multipart identifier (with or without escaping) has been added to the SqlScriptFormatter utility class. This code is utilized to split a table name provided to the edit/initialize request into schema and table name.

_Default Schema Workaround_
The code that retrieves the SMO metadata objects originally used the `[]` operator to access the objects. Due to a bug(?) in SMO, this results in problems when loading tables without a default schema (in our case if you're logged in as SA). Using the metadata object constructors gets around this issue, we are explicitly using them.

* Adding decoding of multipart identifiers
Adding code fix for default schema issue

* Adding some more localizable strings for errors when loading metadata

* Adding localization files... again?

* Changes as per pull request comments

src/Microsoft.SqlTools.ServiceLayer/EditData/IEditMetadataFactory.cs

@@ -16,9 +16,13 @@ namespace Microsoft.SqlTools.ServiceLayer.EditData
         /// Generates a edit-ready metadata object
         /// </summary>
         /// <param name="connection">Connection to use for getting metadata</param>
-        /// <param name="objectName">Name of the object to return metadata for</param>
+        /// <param name="objectNamedParts">
+        /// The multipart name for the object split and unwrapped. At most two components can be
+        /// provided (schema, table/view name). At minimum table/view name can be provided, and
+        /// default schema will be used for schema name.
+        /// </param>
         /// <param name="objectType">Type of the object to return metadata for</param>
         /// <returns>Metadata about the object requested</returns>
-        EditTableMetadata GetObjectMetadata(DbConnection connection, string objectName, string objectType);
+        EditTableMetadata GetObjectMetadata(DbConnection connection, string[] objectNamedParts, string objectType);
     }
 }