Separated LanguageServer into different components

LanguageServer ->
LanguageService - for any functionality that deals with parsing SQL
ServerService - for any functionality that is required to manage the
service layer
WorkspaceService - for any functionality that deals with managing the
state of the workspace, session, or text document

Namespace changes have not been applied yet, so this doesn't build yet.

src/ServiceHost/WorkspaceService/ScriptFileMarker.cs

@@ -0,0 +1,56 @@
+//
+// 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.EditorServices
+{
+    /// <summary>
+    /// Defines the message level of a script file marker.
+    /// </summary>
+    public enum ScriptFileMarkerLevel
+    {
+        /// <summary>
+        /// The marker represents an informational message.
+        /// </summary>
+        Information = 0,
+
+        /// <summary>
+        /// The marker represents a warning message.
+        /// </summary>
+        Warning,
+
+        /// <summary>
+        /// The marker represents an error message.
+        /// </summary>
+        Error
+    };
+
+    /// <summary>
+    /// Contains details about a marker that should be displayed
+    /// for the a script file.  The marker information could come
+    /// from syntax parsing or semantic analysis of the script.
+    /// </summary>
+    public class ScriptFileMarker
+    {
+        #region Properties
+
+        /// <summary>
+        /// Gets or sets the marker's message string.
+        /// </summary>
+        public string Message { get; set; }
+
+        /// <summary>
+        /// Gets or sets the marker's message level.
+        /// </summary>
+        public ScriptFileMarkerLevel Level { get; set; }
+
+        /// <summary>
+        /// Gets or sets the ScriptRegion where the marker should appear.
+        /// </summary>
+        public ScriptRegion ScriptRegion { get; set; }
+
+        #endregion
+    }
+}
+