Explictly excludes E_STRICT from live error level and handle arrays in a backtrace output, rather than trying to convert to string.
MINOR: Replaced usage of renamed classes with the new namespaced name. From: Andrew Short <andrewjshort@gmail.com> git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/sapphire/trunk@90075 467b73ca-7a2a-4603-9d3b-597d59a354a9