Legacy UI 1.15.0 Released

Just a quick announcement of the release of Legacy UI 1.15.0. The main purpose of this release is just to get out a fix for the TRUNK-5712 which had been pending for about two years. The main cause of TRUNK-5712, and why it was so bedeviling to find, is that the affected JS files are all generated in slightly arcane ways. This fix enables implementations to use the X-Content-Type-Options: nosniff header which is recommended by some standard security audits.