ENYO-2431: Cleanup of "inline" properties in layout.design

Enyo-DCO-1.1-Signed-off-by: Yves Del Medico <yves.del-medico@hp.com>
ENYO-2427: Updated layout.design: removed useless "isContainer" and "content". Added "isRepeater" options to "list" kinds

Enyo-DCO-1.1-Signed-off-by: Yves Del Medico <yves.del-medico@hp.com>