This changes PRODUCT_BUNDLE_IDENTIFIER to read org.antlr.v4.swift.macos or
org.antlr.v4.swift.ios. This is similar to the naming scheme used in the Java
code.
The previous identifier was jlabs.Antlr4. I don't know what that refers to.
This comes from https://github.com/janyou/Antlr-Swift-Runtime and is
marked Copyright (c) 2015 janyou on top of the BSD license and Copyrights
for Terence Parr and Sam Harwell derived from the original ANTLR source.
Ewan Mellor