+..Root.StringIterator.+Returns new StringIterator moved forward by arguments value;
Parameters: Int
Return value: new StringIterator
NativeCallable, Callable
auto str.=("Hello world!");
auto x.=(str.begin().+(4));
for (auto it.=(str.begin()).!=, str.end(), it.++, {
if (it.==(x), { log(it.get()) });
});