Load all observing modes

def load_modes(node):
    """Load all observing modes"""
    if isinstance(node, list):
        values = [load_mode(child) for child in node]
        keys = [mode.key for mode in values]
        return dict(zip(keys,values))
    elif isinstance(node, dict):
        values = {key: load_mode(child) for key, child in node}
        return values
    else:
        raise NotImplementedError