PR: Add 'precise' parameter to RangeWidget

[jnsebgosselin]

Introduces a precise boolean parameter to the RangeWidget constructor and passes it to the RangeSpinBox instances, which already have this parameter in its constructor.

"""
Parameters
    ----------
    precise : bool, optional
        If True (default), the spinbox preserves full float64 precision for
        programmatically set values. If False, it behaves like a standard
        QDoubleSpinBox without storing an internal precise value.
"""