Align product names for the artifact signing

We have a number of external dependencies that are built from our repo,
but have various product names.

This PR aligns all projects to the same productname:
    `[assembly: AssemblyProduct("GitExtensions")]`

This is required by SignPath to make sure that OSS projects don’t sign
 3rd party libs.

Project/Configuration/AssemblyInfo.cs

@@ -13,7 +13,7 @@ using System.Runtime.CompilerServices;
 [assembly: StringFreezing]
 
 [assembly: AssemblyTitle("ICSharpCode.TextEditor")]
-[assembly: AssemblyDescription("A .NET text editor control")]
+[assembly: AssemblyDescription("This is a GitExtensions fork of SharpDevelop .NET text editor control")]
 [assembly: AssemblyConfiguration("")]
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]

Project/Configuration/GlobalAssemblyInfo.cs

@@ -20,7 +20,7 @@ using System.Runtime.InteropServices;
 
 [assembly: ComVisible(visibility: false)]
 [assembly: AssemblyCompany("ic#code")]
-[assembly: AssemblyProduct("SharpDevelop")]
+[assembly: AssemblyProduct("GitExtensions")]
 [assembly: AssemblyCopyright("2000-2010 AlphaSierraPapa")]
 [assembly: AssemblyVersion(RevisionClass.FullVersion)]
 [assembly: NeutralResourcesLanguage("en-US")]