* Add ResizeableBox wrapper to component to adjust height
* Use the fixed height on the front end display of the block
* Fix display of resize handle
* Allow the default & min featured product heights to be customized by setting a new theme support keyword, `featured_block`.
* Use `min-height` on the front end display, so content is not clipped on smaller screens
* Add a wrapper div to the content, to prevent it from breaking out of the block display
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