Replace JDK 11 and JavaFX 16 with JDK 17 and JavaFX 17

[processing-bot]

Created by: benfry

Need to switch to the latest LTS versions of the JDK and JavaFX. Just requires a bit more hacking and testing to get everything in place.

Got as far as the following when launching an app on macOS:

2021-10-04 19:18:16.119 Processing[36142:1724471] int launch(char *, int, char **) Error launching JVM Runtime (jdk-17+35) Relative Path: '/Users/fry/coconut/processing4/build/macosx/work/Processing.app/Contents/PlugIns/jdk-17+35' (dylib: (null))
  error: Unable to load Java Runtime Environment.

This may be something simple, or may just need an appbundler update (we're not using the latest source). But there are problem other quirks, so opting not to make the switch for beta 2, which will be focused on stability fixes.

[processing-bot]

Created by: benfry

As of f2e6603 it's possible to switch to Java 17 by commenting out and un-commenting two sections in build.xml.

Fixing this just requires some additional testing.

[processing-bot]

Created by: benfry

Resolved for 4.0 beta 3.

[processing-bot]

Created by: github-actions[bot]

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