A property _ObjectUUID will be added to an object before it is being to
copied, if the property does not exists. Anoter propert _SourceUUID
property will be added to any copied object, with value set to its
source objct's _ObjectUUID.
The FCGlobal.h can be included in a Global.h header file of an extension module.
The reason is that some IDEs (e.g. QtCreator) fails to detect the export/import macros when only defined in the PreCompiled.h files and thus raise a parser warning.