Use new qcodes syntax for adding parameters

Description

Use the new syntax for adding parameters to an instrument. Excerpt from https://qcodes.github.io/Qcodes/examples/writing_drivers/Creating-Instrument-Drivers.html#What's-a-Parameter?

class Weinschel8320(VisaInstrument):
    def __init__(self, name, address, **kwargs):
        super().__init__(name, address, terminator="\r", **kwargs)

        self.attenuation = Parameter(
            "attenuation",
            instrument=self,
        )

To Do: This might also work with submodules, but the qcodes documentation on the subject is very thin. So this needs to be investigated.

Motivation

In contrast to the option of using add_parameter, this works with static code checkers and auto completion. It is also much more readable.

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