ISIS-589: simplified the CSS bundling, fixed some issues

Specifically:
* no need to contribute a list of classes, just a single will suffice
* no need for IsisBlobOrClobPanelAbstract, has no CSS
* cannot bundle LinksSelectPanelAbstract, since has images relative to class, referenced by its in CSS

In addition:
* fixed some existing CSS that wasn't correctly scoped so was not being applied.