MicroView widget demo, mainly for new WIDGETNOVALUE flag

This new sketch is added to the examples folder. It demonstrates the use of the **WIDGETNOVALUE** flag, which suppresses the drawing of a widget's numeric value.

Examples 1 - 7 just show all the widgets, both with and without numeric values. Examples 8 and higher show various possibilities for adding code to display the numeric value in different ways.

The copyright for this sketch is attributed to **GeekAmmo**, so that it is consistent with other examples in the library. I hereby relinquish the copyright for this sketch to **GeekAmmo**. Feel free to claim it as your own if you decide to include it.

This sketch requires the changes in pull request #18, which will be included if this request is merged.