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/IntelliSenseSettings.cs

@@ -0,0 +1,68 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+namespace Microsoft.SqlTools.CoreServices.SqlContext
+{
+    /// <summary>
+    /// Class for serialization and deserialization of IntelliSense settings
+    /// </summary>
+    public class IntelliSenseSettings
+    {
+        /// <summary>
+        /// Initialize the IntelliSense settings defaults
+        /// </summary>
+        public IntelliSenseSettings()
+        {
+            this.EnableIntellisense = true;
+            this.EnableSuggestions = true;
+            this.LowerCaseSuggestions = false;
+            this.EnableErrorChecking = true;
+            this.EnableQuickInfo = true;
+        }
+
+        /// <summary>
+        /// Gets or sets a flag determining if IntelliSense is enabled
+        /// </summary>
+        /// <returns></returns>
+        public bool EnableIntellisense { get; set; }
+
+        /// <summary>
+        /// Gets or sets a flag determining if suggestions are enabled
+        /// </summary>
+        /// <returns></returns>
+        public bool? EnableSuggestions { get; set; }
+
+        /// <summary>
+        /// Gets or sets a flag determining if built-in suggestions should be lowercase
+        /// </summary>
+        public bool? LowerCaseSuggestions { get; set; }
+
+        /// <summary>
+        /// Gets or sets a flag determining if diagnostics are enabled
+        /// </summary>
+        public bool? EnableErrorChecking { get; set; }
+
+        /// <summary>
+        /// Gets or sets a flag determining if quick info is enabled
+        /// </summary>
+        public bool? EnableQuickInfo { get; set; }
+
+        /// <summary>
+        /// Update the Intellisense settings
+        /// </summary>
+        /// <param name="settings"></param>
+        public void Update(IntelliSenseSettings settings)
+        {
+            if (settings != null)
+            {
+                this.EnableIntellisense = settings.EnableIntellisense;
+                this.EnableSuggestions = settings.EnableSuggestions;
+                this.LowerCaseSuggestions = settings.LowerCaseSuggestions;
+                this.EnableErrorChecking = settings.EnableErrorChecking;
+                this.EnableQuickInfo = settings.EnableQuickInfo;
+            }
+        }
+    }
+}