Use a newer, OWASP-recommended Javascript code block to break from frames.
Add support for the X-Frame-Options HTTP response header.
Straight upgrade from 6.x-1.x.
#2305783: Wrong variable type for Auto Hide Mode parameter by AdamMMA Library error message has been wrapped with t().
Implements #2304557: Disable resizable from summary on fields of type text_with_summary
Implements #2305405: More intuitive UI to disable #resizable on textareas