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Report and tolerate XML GUI object setting errors when parsing XML attribute…

Description

Report and tolerate XML GUI object setting errors when parsing XML attribute strings as values for settings that don't exist on the GUI object.

Following rP290, rP1494, rP14953, ... the XML errors were silently ignored.
Following rP22796 it led to a crash (m_Setting access for an item that does not exist).

Differential Revision: https://code.wildfiregames.com/D2297
Tested on: clang 8.0.1, Jenkins