Implement --no-SOME_OPTION

I want these mutually exclusive options:

- --updateParts
- --not-updateParts

The default is to update parts, and it's disabled if the second flag is passed. The user needs to pass one flag or the other (so they don't get a behavior they didn't explicitly ask for).

Is there any way to do this? I had a go with this:

`class Options
{
private static bool _updateParts;

public Options(bool updateParts, bool doNotUpdateParts)
{
_updateParts = updateParts;
if (doNotUpdateParts) _updateParts = false;
}

[Option('c', "updateParts", SetName = "update", Required = true, Default = true)]
public static bool UpdateParts { get { return _updateParts; } }

[Option('C', "no-updateParts", SetName = "noUpdate", Required = true, Default = false)]
public static bool DoNotUpdateParts { get { return !_updateParts; } }
}`

Generally speaking this works, but it means I can't add two other options which are mutually exclusive. Imagine I now want to add:

- --doLogging
- --not-doLogging

I can't make them mutually exclusive because they don't belong to either set update or noUpdate.

No source file or test is named. Start by tracing how Option attributes, SetName, Required, and Default are validated, then examine how multiple mutually exclusive groups are represented. Done means independent updateParts and doLogging flag pairs can each enforce their own exclusivity without conflicting groups, with coverage for omitted and conflicting flags.

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