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