* fixed: failed to build RoboVM using Java19

[dkimitsa]

Root cases:

• Tests started to fail due JDK changes in toString() of annotations (https://github.com/openjdk/jdk/pull/7418).
• Eclipse Tycho has to be updated to know JDK19-env

Fixes:

• tycho updated to 3.0.3. This also cause update-side to be migrated to repository (as first one was removed) -- completely not tested
• test cases: host JDK18 and JDK19 has different behaviour -- test cases were updated just to recognize this case and adapt string to match JDK18/RoboVM
• gradle plugin: build script migrated to use gradle 8
• idea pluing: build script migrated to use gradle 8

[Tom-Ski]

Whats status of this one @dkimitsa ?

[dkimitsa]

@Tom-Ski synchronised and pushed Idea and Gradle plugin changes (building using gradle 8)

[dkimitsa]

hm, ok, seems like eclipse plugin after changes can't be build using java17

Type org.eclipse.tycho.p2maven.repository.P2ArtifactRepositoryLayout not present: org/eclipse/tycho/p2maven/repository/P2ArtifactRepositoryLayout has been compiled by a more recent version of the Java Runtime (class file version 61.0), this version of the Java Runtime only recognizes class file versions up to 55.0