Avoid single child layout containers #2388
Merged
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Make it so that we don't need page rows to wrap single elements, which makes it so we don't have to filter anything in the Hierarchy Explorer - it shows the page content exactly as it is in the DOM.
Optimizes pages according to this when writing to disk or merging pages to the DOM too, as had been discussed before.
Also includes some general improvements and fixes to the editor/drag-and-drop, mostly to keep everything consistent with this.
Closes #2302