JM Layouts plugin

What left from JMTheme plugin after changes in core for 2.3.1 version

version 1.1.0

REMOVED theme name and folders as the part of settings Tested with Cayman

version 1.0.3

FIX not needed option key in option file, only file name is important

version 1.0.2

FIX Added by mistake deleted Generate page

version 1.0.1

FIX: hidden type is not working with json data, see #4468
UPDATE: removed not used globals