Fixing iterators in `\util\Collection`.
Fixing iterators in `\util\Collection`.

SensCritique/lithium,graphis/lithium,muyehub/lithium,whowgames/lithium,UnionOfRAD/lithium,datachand/lithium,UnionOfRAD/lithium,davidpersson/lithium,jails/lithium,qoqa/lithium,m4rcsch/lithium-core-library,UnionOfRAD/framework,whowgames/lithium,davidpersson/lithium,jails/lithium,pixelcog/lithium,pixelcog/lithium,wbeater/lithium,graphis/lithium,qoqa/lithium,datachand/lithium,m4rcsch/li3_framework,mehlah/lithium,mehlah/lithium,m4rcsch/lithium-core-library,SensCritique/lithium,wbeater/lithium,muyehub/lithium