Provide arguments to process function as dictionary

[frankenjoe]

Currently, additional arguments to the process function are passed as additional keyword arguments. This means that a function cannot share argument names with the interface class. E.g.:

import numpy as np
import audinterface


def process_func(x, sr, verbose):
    if verbose:
        print('I was here')
    return x


process = audinterface.Process(
    process_func=process_func,
    verbose=True,
)
sampling_rate = 16000
signal = np.zeros(sampling_rate)
process(signal, sampling_rate)

TypeError: process_func() missing 1 required positional argument: 'verbose'

Apart from that, it's difficult for the user to distinguish between arguments to the interface and to the function.

So I recommend we fix this in the same way as in audobject, i.e. deprecate **kwargs and replace it with a dictionary process_func_args.

[hagenw]

Hehe, I see you restart our very old discussion on this one. Seems like we decided for the wrong solution at that time. Fell free to change it.