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Selector related components

* Trigger
the Selector is just a user interface dressing up of Trigger, an abstract device that emits signal values.

* Glyph
at the user interface side of things, the Selector is a composition of an encapsulator for catching device events applied to a Glyph. The Glyph is the basic abstraction for graphical output.

* InputDevice
the combinator used to catch device events destined for the Glyph.

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