Simplify and improve TStringHelper.Split.

First, this avoids code duplication entirely by a very clever trick of assuming virtual separator at the end of the string.

Second, this uses logarithmic growth, removing quadratic factor from DupeString('piece,', 10 * 1000 * 1000).Split([',']).

Version with LOCAL PROCEDURES kept: split_lp.patch.

Edited Oct 12, 2022 by Rika

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