Ability to run PSADT using pwsh 7+

I noticed this [https://github.com/PSAppDeployToolkit/PSAppDeployToolkit/issues/475](issue / feature request) and thought that PSADT is one of the things that are keeping me from moving to Powershell 7.

I created a fork and started working on making PSADT run under powershell 7:

It works but i have not tried anything but running the default Deploy-Application.ps1. I still need to change the behavior of Deploy-Application.exe and probably some other things.

Please let me know if you have any thoughts!

We are going to make it compatible with ps7 eventually however, no point in doing that now because as I have said before, we are working on v4 and new UI.

Oh i see. Well it wasnt that much of a change to the code. I am looking forward to v4!