Function: windowsPowerShellPath()
windowsPowerShellPath():
string
The in-box Windows PowerShell 5.1 of this machine by absolute path: %SystemRoot%\System32\WindowsPowerShell\v1.0\powershell.exe.
For code that runs on the end user's machine (electron-updater); electron-builder takes PowerShell from toolsets.executables.
Returns
string