Use paket package manager

Pick up VS integration from nuget packages
Fix analyzer warnings

.gitignore

@@ -166,3 +166,4 @@ pip-log.txt
 
 # Nuget packages
 /packages
+/paket-files

ImageComments.sln

@@ -3,6 +3,11 @@ Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio 15
 VisualStudioVersion = 15.0.27428.2005
 MinimumVisualStudioVersion = 10.0.40219.1
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = ".paket", ".paket", "{3D25D288-D5EC-4E08-A8D6-8CD7429388A4}"
+	ProjectSection(SolutionItems) = preProject
+		paket.dependencies = paket.dependencies
+	EndProjectSection
+EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{5F0DF01A-F177-4AD2-A7C2-E71A530C2DD3}"
 	ProjectSection(SolutionItems) = preProject
 		License.txt = License.txt

ImageCommentsExtension/ExceptionHandler.cs

@@ -1,11 +1,14 @@
 namespace LM.ImageComments.EditorComponent
 {
+    using Microsoft.VisualStudio.Shell;
     using System;
 
     internal static class ExceptionHandler
     {
         public static void Notify(Exception ex, bool showMessage)
         {
+            ThreadHelper.ThrowIfNotOnUIThread();
+
             string message = string.Format("{0}: {1}", DateTime.Now, ex.ToString());
             Console.WriteLine(message);
             if (showMessage)

ImageCommentsExtension/ImageAdornmentManager.cs

@@ -6,6 +6,7 @@ namespace LM.ImageComments.EditorComponent
     using System.Windows.Controls;
     using System.Windows.Media;
     using System.Xml;
+    using Microsoft.VisualStudio.Shell;
     using Microsoft.VisualStudio.Text;
     using Microsoft.VisualStudio.Text.Editor;
     using Microsoft.VisualStudio.Text.Formatting;
@@ -42,6 +43,8 @@ static ImageAdornmentManager()
         /// </summary>
         public static void ToggleEnabled()
         {
+            ThreadHelper.ThrowIfNotOnUIThread();
+
             Enabled = !Enabled;
             string message = string.Format("Image comments {0}. Scroll editor window(s) to update.",
                 Enabled ? "enabled" : "disabled");
@@ -72,6 +75,8 @@ private void contentTypeChangedHandler(object sender, ContentTypeChangedEventArg
         /// </summary>
         private void LayoutChangedHandler(object sender, TextViewLayoutChangedEventArgs e)
         {
+            ThreadHelper.ThrowIfNotOnUIThread();
+
             if (!Enabled)
                 return;
 
@@ -122,6 +127,8 @@ private void CreateVisuals(ITextViewLine line, int lineNumber)
             bool imageDetected = false; // useful for tracing
 #pragma warning restore 219
 
+            ThreadHelper.ThrowIfNotOnUIThread();
+
             string lineText = line.Extent.GetText();
             string matchedText;
             int matchIndex = ImageCommentParser.Match(_contentTypeName, lineText, out matchedText);