Disable shadow copying of assemblies in .NET 4.6.x

On Windows this seems to default to true, and it causes issues as the `Location`
attribute of our assemblies intead points to the cached assembly. Unfortunately,
we use this attribute to find e.g. the PSReadLine module. So we disable shadow
copying of assemblies.

This is not applicable to .NET Core.

Author: andyleejordan

src/PowerShellEditorServices.Hosting/EditorServicesLoader.cs

@@ -111,6 +111,9 @@ public static EditorServicesLoader Create(
             // In .NET Framework we add an event here to redirect dependency loading in the current AppDomain for PSES' dependencies
             logger.Log(PsesLogLevel.Verbose, "Adding AssemblyResolve event handler for dependency loading");
 
+            // We also disable shadow copied assemblies so that the `Location` attribute is correct
+            AppDomainSetup.ShadowCopyFiles = false;
+
             if (hostConfig.LogLevel == PsesLogLevel.Diagnostic)
             {
                 AppDomain.CurrentDomain.AssemblyLoad += (object sender, AssemblyLoadEventArgs args) =>