Move unused forked code to external directory (#1192)

* Move unused forked code to external directory

* Fix SLN build errors

* Add back resource provider core since it's referenced by main resource provider project

* Update PackageProjects step of pipeline

external/Microsoft.SqlTools.CoreServices/SqlContext/SqlToolsSettingsValues.cs

@@ -0,0 +1,54 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Newtonsoft.Json;
+
+namespace Microsoft.SqlTools.CoreServices.SqlContext
+{
+    /// <summary>
+    /// Class that is used to serialize and deserialize SQL Tools settings
+    /// </summary>
+    public class SqlToolsSettingsValues : ISqlToolsSettingsValues
+    {
+        /// <summary>
+        /// Initializes the Sql Tools settings values
+        /// </summary>
+        public SqlToolsSettingsValues(bool createDefaults = true)
+        {
+            if (createDefaults)
+            {
+                IntelliSense = new IntelliSenseSettings();
+                // QueryExecutionSettings = new QueryExecutionSettings();
+                // Format = new FormatterSettings();
+            }
+        }
+
+        /// <summary>
+        /// Gets or sets the detailed IntelliSense settings
+        /// </summary>
+        public IntelliSenseSettings IntelliSense { get; set; }
+
+        // /// <summary>
+        // /// Gets or sets the query execution settings
+        // /// </summary>
+        // [JsonProperty("query")]
+        // public QueryExecutionSettings QueryExecutionSettings { get; set; }
+
+        // /// <summary>
+        // /// Gets or sets the formatter settings
+        // /// </summary>
+        // [JsonProperty("format")]
+        // public FormatterSettings Format { get; set; }
+
+        /// <summary>
+        /// Gets or sets the formatter settings
+        /// </summary>
+        [JsonProperty("objectExplorer")]
+        public ObjectExplorerSettings ObjectExplorer { get; set; }
+    }
+}