IDE-1602 new layout template editor using sapphire
- model the elements
- there pages ui editor
IDE-1602 improved layouttpl editor
- save model to source file only when switch from design page to preview or source page
- removed blank template from the new layout tpl wizard because it writes model to source file
- give icons to nodes
IDE-1602 Switched to @DefaultValue annotation
IDE-1602 source formatting