Delete CGUI::UpdateObjects and don't recreate the entire object
hierarchy by recursing through the existing one each time when inserting
one GUI Object.
Change CGUI::AddObject to only insert the one relevant pointer into the
map hierarchy, return success value and delete the child upon failed
insertion in the caller instead of leaking it.
Defer GUIM_LOAD and UpdateCachedSize recursion until all XML files
linked in the page XML file were loaded.
Delete related ERROR_TYPE NameAmbiguity, ObjectNeedsName, and unrelated
JSOpenFailed and in consistency with the rest, do the LOGERROR in the
scope where the error occurs.
Delete ERROR_TYPE InvalidSetting from 90f6641c1d unused following
85a622b13a, 1a49ccb294, ERROR_TYPE OperationNeedsGUIObject from
90f6641c1d unused following d3e56f0f57, see also e1014aad3b, refs #128.
This was SVN commit r23067.
