Fix crash caused by erasing map elements while iterating in System.cpp. #1436
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This might fix the crash reported in the forum, where after the Experimentors are active the game crashes on OSX.
In System::Copy there is for loop iterating over the map of starlanes and deleting elements. It does not account for the deleted elements while iterating so it could step into nowhere.
This PR fixes that problem. However, since I can't replicate the crash it may not fix the crash.