Revert "Update SU SDK to 0.5.2064, Update VCRTFowarders to 1.0.5"

This reverts commit c0147ec888.

Reverting Update on SDK

Assets/Packages.meta

@@ -1,5 +1,5 @@
 fileFormatVersion: 2
-guid: 228653e1180da964bb92a384bc8250f2
+guid: c0726087bc953454da8e8bebfd2f4a92
 folderAsset: yes
 DefaultImporter:
   externalObjects: {}

Assets/packages.config

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Microsoft.MixedReality.SceneUnderstanding" version="0.5.2064" />
-  <package id="Microsoft.VCRTForwarders.140" version="1.0.5" />
+  <package id="Microsoft.MixedReality.SceneUnderstanding" version="0.5.2042-rc" />
+  <package id="Microsoft.VCRTForwarders.140" version="1.0.2-rc" />
   <package id="Microsoft.Windows.MixedReality.DotNetWinRT" version="0.5.1037" />
 </packages>