This enables building PowerShell through VS Code. The build task
launches the installed version of PowerShell and runs
`Start-PSBuild` (after importing the module).
This enables a `launch` debug task to immediately debug the `powershell`
process, without having to attach to an external process.
The defaults of `justMyCode` and `stopAtEntry` have been reversed, so
that all code is debugged, and the process is stopped at entry for
easier debugging.
Note that an interactive PowerShell process requires access to `stdin`,
which the debug console does not provide, so once it requests access,
`System.Console` will throw a (correct) exception.
