Allow hidding some ewoks input and / or output to Orange

close #31 (closed)

result

interface before the PR interface after the PR and adding the following to the widget

class MyEwoksOrangeWidget:
    ...
    _ewoks_inputs_to_hide_from_orange = (
        "__process__",
        "raw_projections_required",
        "raw_projections_each",
        "raw_darks_required",
        "raw_flats_required",
    )