In IGUITreeView "clearChilds" and "hasChilds" deprecated for "clearChildren" and "hasChildren" (thx @Greenya for noticing)
Same childs => children in a few places in documenatation and variables.
Removed a compile warning in CCubeSceneNode.


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@3330 dfc29bdd-3216-0410-991c-e03cc46cb475