Removes unnecessary duplicate logic to remove del and ins tags in ReferentialText#toPublishables.
Improves ReferentialText#toPublishables to recognize common browser RTE pattern <div>text</div><div><br></div> and convert to paragraph.
Fixes nodes after final <br><br> not being recognized as paragraph sometimes.
Adds logic for unwrapping nested <p> tags in ReferentialText#toPublishables.
Fixes ReferentialText sometimes not converting the last <div> into <p>.
Changes SqlDatabase symbols cache to use Lazy instead of PullThroughValue so that it's never invalidated due to memory pressure.