Adapt algorithms to the work on the dataclasses

[JuliusWelzel]

As discussed, we should hand our own data classes to the functions @masoud translated.

Anyone has comments on this?

[rmndrs89]

In principle the data loaders should just return an instance of a MotionData object. In the first lines of the main loop, the user should then extract the relevant sensor data. In our case this is the acceleration data from the lower back. In pseudo-code that would look like:

motion_data = some_dataset.load_file(file_name)  # MotionData object

# Loop over the list of recordings
for idx, recording_data in enumerate(motion_data.data):
    sampling_frequency = recording_data.sampling_frequency

    # Extract acceleration from the lower back sensor
    lower_back_acc = ...

[JuliusWelzel]

I think it depends if an importer returns a RecordingData or MotionData class. But in general, it should work that way.

[rmndrs89]

Works for now as expected!