Team update: Editorial

The first cycle finished yesterday. First run patch for supporting HTML in image captions is on #18311. Includes handling of the HTML in both editors and basic UI for inserting a link in the image properties tab in the gallery.

For the second cycle: testing, refining and committing HTML support for image captions, finishing up DFW support for editors not on the write screen, other editor enhancements and code improvements for example using the native MCE dialogs for our plugins instead of thickbox.