Move JDK download logic to build.xml, remove JRE Downloader Ant Task

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Created by: benfry

I originally wrote a custom Ant Task to handle setting the right cookies and headers to download the JRE and JDK from Oracle when used with Java 8. It's no longer necessary with AdoptOpenJDK and OpenJFX, so the code can be removed. (No logins required, only JDK supported.)

Also, with JDK 11.0.9.1, it was necessary to add nasty hacks because the version had an extra .1, so this vestigial code is even uglier than before.

Fixing this later so it doesn't hold up alpha 3…

[processing-bot]

Created by: benfry

Removed with d57db28

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Created by: github-actions[bot]

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