add style-level screening to clean_html!
Ticket
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we are currently stripping inline style attributes on save. this gets rid of lots of undesired stuff like fonts and such but also many things that are often desirable, like strike-through. And these style attributes are used by tinyMCE, so stripping them means many tinyMCE options won't work.
+solution
if we make it configurable (to developers and eventually to wagneers) to choose which style settings can and can't be used, we can improve signal to noise here.