Give feedback for common layout gotchas

For example, it would be nice to detect if the user has specified bindings to the x, y, width or height properties for items managed by a layout. The docs say:

Note: It is not recommended to have bindings to the x, y, width, or height properties of items in a layout, since this would conflict with the goals of Layout, and can also cause binding loops.

The same applies to using vertical anchors for items managed by a vertical layout, and horizontal anchors for items managed by a horizontal layout.

We could highlight the binding with a warning informing the user about what is wrong and how they can fix it.