Lee Bradley 0570df95a8 Optimization for SiteTree::allowedChildren()
Adds an `Object::extend('updateAllowedChildren')` whilst also
  caching the default response

Using `get_class($this)` as cache key as this is what is used
  in `Configurable::stat($name)` to retrieve the candidates
2017-09-06 12:58:17 +12:00
..
2017-05-08 17:57:24 +12:00
2017-06-21 16:29:40 +12:00
2017-04-27 11:43:04 +12:00