Remove retrolambda and custom functional interfaces in favour of java.util.function

[Copilot]

Now that the engine targets Java 8+, the retrolambda backport plugin and the hand-rolled functional interfaces in com.jme3.util.functional are no longer needed.

Deleted

• com.jme3.util.functional.Function<R,T> → java.util.function.Function<T,R> (note reversed type-param order)
• com.jme3.util.functional.NoArgFunction<R> → java.util.function.Supplier<R>
• com.jme3.util.functional.NoArgVoidFunction → java.lang.Runnable
• com.jme3.util.functional.VoidFunction<T> → java.util.function.Consumer<T>

Updated — BufferLayout.java

The only in-tree consumer of the custom interfaces. Function<Boolean, Object> (a predicate by usage) is replaced with java.util.function.Predicate<Object>:

// Before
private Function<Boolean, Object> filter;
public ObjectSerializer(Function<Boolean, Object> filter) { … }
return filter.eval(obj);

// After
private Predicate<Object> filter;
public ObjectSerializer(Predicate<Object> filter) { … }
return filter.test(obj);

Build

• Removed classpath libs.gradle.retrolambda, apply plugin: 'me.tatarka.retrolambda', and the retrolambda { … } configuration block from build.gradle.
• Removed the gradle-retrolambda entry from gradle/libs.versions.toml.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• dl.google.com
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.lang.invoke=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-opens=java.base/java.nio.charset=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED --add-opens=java.xml/javax.xml.namespace=ALL-UNNAMED -XX:MaxMetaspaceSize=384m -XX:+HeapDumpOnOutOfMemoryError -Xms256m -Xmx512m -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)