Function lowercase

Sources/Shared/Containers/StringUtils.cpp:876–884

	}

	String lowercase(StringView string) {
		// Theoretically doing the copy in the same loop as case change could be faster for *really long* strings due
		// to cache reuse, but until that proves to be a bottleneck I'll go with the simpler solution.
		// Not implementing through lowercase(String) as the call stack is deep enough already and we don't
		// need the extra checks there.
		String out{string};
		lowercaseInPlace(out);
		return out;
	}

	String lowercase(String string) {
		// In the rare scenario where we'd get a non-owned string (such as String::nullTerminatedView() passed right