Download and copy DLLs during build

Args.dll (needed for GeckofxHtmlToPdf) was not being copied
during the build after .NET modernizations.

Also include harvests in patch logs to make this type of
omission easier to troubleshoot in the future.

Also fix whitespace and build instructions in
Setup-InstallerBuild.ps1

Author: papeh

.github/workflows/patch-installer-cd.yml

@@ -293,3 +293,5 @@ jobs:
           path: |
             ./*.log
             ./*.binlog
+            ./PatchableInstaller/CreateUpdatePatch/Master/AppHarvest.wxs
+            ./PatchableInstaller/CreateUpdatePatch/Update/AppHarvest.wxs