v2.14.0

• [CHANGED] #519 Refactored custom icon configuration:
  
  (see also the theming tutorial)
  • [Added] options.icon option/callback.
    
    Valid values are true, false, a string containing a class name or image
    url, or a callback returning that.
  • [Changed] node.icon option. Valid values are true, false, or a string
    containing a class name or image url.
    
    This option existed before, but was stored in the node.data.icon namespace,
    and did not accept class names.
  • [Deprecated] options.iconClass callback: use options.icon instead
  • [Deprecated] options.icons: use options.icon instead
  • [Deprecated] node.data.iconclass option: use node.icon instead
  • [Deprecated] node.data.icon option: use node.icon instead
• [Added] tree.clear() method.
• [Added] #520 ext-persist: new event beforeRestore
• [Fixed] #533 table-ext: nodeSetExpanded triggers redundant events
• Commit details.