Fix class duplication bug with reloads #450
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This fixes a nasty bug where classes were being duplicated in dev with Zeitwerk reloads and
ActiveSupport::DescendantsTracker. So for example you'd have aPostsubclass ofBridgetown::Model::Base, and you'd reload, and now you'd have twoPosts, reload again, and you'd have threePosts, etc. Argh. Now descendant classes are specifically removed from the descendants tree upon unload.