Fix ticket #3057: apply HTML escaping on special characters in Twitter import
Changes the replacement of Twitter "entities" from in-place reverse ordering ('to preserve indices') to a forward-facing append-in-chunks that pulls in both the text and link portions, and escapes them all. This unfortunately means first *de*-escaping the < and > that Twitter helpfully adds for us.... and any literal &blah;s that get written. This seems to match Twitter's web UI, however horrid it is.
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