Clean up "load from .tgz" process

[isc-tleavitt]

In %IPM.Main:Load:

    } ElseIf ##class(%File).Exists(tDirectoryName),$$$lcase($Piece(tDirectoryName, ".", *)) = "tgz" {
        Set tTargetDirectory = $$$FileTempDirSys
        Set tSC = ##class(%IPM.General.Archive).Extract(tDirectoryName, tTargetDirectory)
        $$$ThrowOnError(##class(%IPM.Utils.Module).LoadNewModule(tTargetDirectory, .tParams))
    }

This should:

• Support .tar.gz as well
• Specifically cover the case of a download of a GitHub release - so there's a nested directory too to account for
• Check the status from Extract ($$$ThrowOnError)