VboxManage slash/backslash handling

[rogierschouten]

I use VirtualBox with a Windows host and Windows guest. Still, I find that VBoxManage guestcontrol removes backslashes from various arguments in various sub-commands, but not all. Sometimes forward slashes are the solution, sometimes double backslashes are the solution.

Please make slash handling the same for all commands and arguments, and preferably allow Windows style CLI when using Windows host and Windows guest and CMD terminal.