Fix cldr-to-icu tooling to work on Windows
The cldr-to-icu tools don't work out of the box on Windows. There are a few tweaks needed for the Ant tooling to work as well as for UTF-8 character encoding when reading data files.
For example, when running the ant -f build-icu-data.xml command, I get the following error:
When reading the header comments for the ICU data files, the copyright symbol © gets garbled when not using UTF-8.