Add boolean Option and Property in addition to the Flag type

[Siegfried Steiner]

Impediment:

For boolean values, currently just the Flag type is provided, explicitly having an Option or a Property which can be set to true or false is not provided even though it can emphasize on the semantics of the syntax declaration.

Proposal:

Add a BoolenOption as well as a BoolenProperty alongside their counterparts in the CliSugar.

Discussion:

Having this additional types may result in less concise syntax definitions as there are three ways to do the same thing.

[Siegfried Steiner]

The types BooleanOption and BooleanProperty alongside their CliSugar counterparts will be available in the next snapshot (release).