oneOf #22 & anyOf #23

[hupf]

Implemented the oneOf and anyOf renderers just as in the Material renderer set.

• Since we yet don't have any approach of how to click on tabs in the Enzyme tests, I had to skip some tests where this is necessary.
• There is also the https://github.com/eclipsesource/jsonforms/blob/08c6b93fe355d454c97bc8e821382a4b08318ab9/packages/material/src/controls/MaterialAnyOfStringOrEnumControl.tsx#L102 renderer, which covers the "AnyOf Simple" example. Maybe this should also be included?