[RSS Feed/News] AnalyzeUsage::analyzeUnfurlUsage is very fragile

[XenForo]

XF\BbCode\ProcessorAction\AnalyzeUsage::analyzeUnfurlUsage is written as a final hook, meaning it works on final text and not per tag via a tag hook which has access to parsed options. This causes the code to need to extract/detect the unfurl attribute and url contents twice.

This results in the unfurl format in the analyzer being very fragile, and doesn't really matched how unfurl handling works elsewhere.

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