Add VM-Install-Proxy-Execution

[mr-tz]

For common and more involved install mechanisms there should exist a helper function like VM-Install-Raw-GitHub-Repo etc.

See https://github.com/mandiant/VM-Packages/wiki/Contributing#example-4 for a good candidate of tools run via cmd.exe, for example.

[MalwareMechanic]

Oh I like this! Then we could also have a function argument, or environment variable, that allows you to specify your preferred proxy execution mechanism (e.g., cmd or powershell). @Ana06 you had mentioned something like this before

[MalwareMechanic]

Similar to #2

[Ana06]

I think this has already been address. @mr-tz can we close this issue?