Add "slider" support to allow wider range of values with min/max. This still supports anchor / labels which can be included but will only use the first and last values in the options array as the bounds.
Updated rounding on anchor angles to now be by two decimal places.
Updated index-skip option to skip-angle which goes by angle instead of options indexes. This makes it much easier to specify the tolerance for a rotation. This works especially well where the knob may be used as a two value switch.
