Fix #350 - Strip styled components referenced in css by not used in the render #351
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This PR removes CSS rules referencing unused styled components from the snapshot. See #350 for details.
The approach I took here was adding a filter for CSS rules which contain references to unknown styled component class names.
Note that this also fixes a test; "referring to other components", which was incorrectly passing, as it contained a reference to a container element that was never used.