Re-factored the _download.cmd script and added comments so that the downloader tools are prioritized with Powershell first, wget second, and bitsadmin last.
Re-factored the _download.cmd script and added comments so that the downloader tools are prioritized with Powershell first, wget second, and bitsadmin last.

boxcutter/windows,boxcutter/windows,HirotakaKato/boxcutter-windows-ja,boxcutter/windows,HirotakaKato/boxcutter-windows-ja,HirotakaKato/boxcutter-windows-ja