Update Image Watch Tutorial

Updated the Windows Visual Studio Image Watch tutorial to include download links to the latest versions of Visual Studio Image Watch for newer Visual Studio versions.

doc/tutorials/introduction/windows_visual_studio_image_watch/windows_visual_studio_image_watch.markdown

@@ -18,8 +18,8 @@ This tutorial assumes that you have the following available:
 Installation
 ------------
 
-[Download](http://go.microsoft.com/fwlink/?LinkId=285460) the Image Watch installer. The installer
-comes in a single file with extension .vsix (*Visual Studio Extension*). To launch it, simply
+Download the Image Watch installer. ([Visual Studio 2019](https://marketplace.visualstudio.com/items?itemName=VisualCPPTeam.ImageWatch2019) | [Visual Studio 2017](https://marketplace.visualstudio.com/items?itemName=VisualCPPTeam.ImageWatch2017) | [Visual Studio 2012, 2013, 2015](https://marketplace.visualstudio.com/items?itemName=VisualCPPTeam.ImageWatch))
+The installer comes in a single file with extension .vsix (*Visual Studio Extension*). To launch it, simply
 double-click on the .vsix file in Windows Explorer. When the installer has finished, make sure to
 restart Visual Studio to complete the installation.