MOD: When loading Imageset XML, skip (re)defining existing resources (with a warning).
MOD: When loading Imageset XML, skip (re)defining existing resources (with a warning).

ruleless/CEGUI,OpenTechEngine/CEGUI,ruleless/CEGUI,OpenTechEngine/CEGUI,OpenTechEngine/CEGUI,ruleless/CEGUI,ruleless/CEGUI,OpenTechEngine/CEGUI