Current Showcase App

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Situation

Currently there are three tabs in the showcase app:

1. Form fields - Magnolia specific fields. 
2. Vaadin fields - Vaadin fields that can be used with Magnolia.
3. Unsupported fields - Not clear why we specify what Vaadin fields NOT to use. The list of controls is not extensive, implying either that there are many more controls that can be added (in which case the form field tab and Vaadin fields tab are incomplete) or that the list of banned controls is incomplete.

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Need to include information on using each control. How? What kind of information?

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