API Replace FormActions with anchors to enable panel-based loading in GridField navigation buttons #8953
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This replaces the Prev, Next, and New buttons in GridField "better buttons" from FormActions to simple anchors. Doing this means that (a) they don't have their own loading indicators, and (b) the CMS panel automatically obtains a loading indicator while processing.
None of these actions are POST actions, so don't need to be FormActions (technically speaking).
This also adds tooltips and ARIA labels for accessibility to these buttons, and changed the new class names for circular buttons to be more BEM compliant.
Issue: silverstripe/silverstripe-admin#815
Note: this is removing public API, but those were added in #8569 and haven't been tagged in a stable release yet. They aren't needed for anchor based buttons, so I've deleted them.