Quizzer::Element - Base input element
This is the base object on which many different types of input elements are built. Each element represents one user interface element in a FrontEnd.
Returns true if an Element is of a type that is displayed to the user. This is used to let confmodules know if the elements they have caused to be displayed are really going to be displayed, or not, so they can avoid loops and other nastiness.
Causes the element to be displayed, allows the user to interact with it to specify a value, and returns the value they enter (this value is later used to set the value of the accociated question).
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