Regularise how Webview handles styling, and add show/hide to Lacci #343
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Description
Add parent styles to Scarpe Webview as a thing, and have the various widgets pick up on that. In order to make styles mergeable, convert all style hash keys to symbol, not a mix of symbol and string.
As a side effect, that means we can set a "hidden" property on the widget in the parent and pick it up in the children.
For added fun, there's a test that makes one of all the top-level widgets, puts it into an array called @ widgets and then does a bunch of stuff to mess with it.
Checklist