Multi project build

[koppor]

This PR introduces gradle multi project build.

• Follow-up to Prepares multi module build #11921
• Basis for Extract libraries out of JabRef ("Toolkit") / Offer JabRef as library / jar / maven central / JabKit #110

TODO

• citation style catalog not found
• JabKit CLI does not start
• java.lang.module.FindException: Module mysql.connector.j not found, required by org.newsclub.net.mysql
• jpackage on macOS: Error: This JDK does not contain packaged modules and cannot be used to create another image with the jdk.jlink module
• Fix Unit Tests (paths)
• Fix GUI Tests (possibly postgres issue)
• Execution failed for task ':jabgui:jlink'. java.base module not found in /opt/hostedtoolcache/Java_Temurin-Hotspot_jdk/24.0.1-9/x64/jmods --> partially fixed by downgrade to JDK23
• test jpackage build --> GUI only
• enable native access --> paramter in jabgui build.gradle.kts
  WARNING: Use --enable-native-access=com.sun.jna to avoid a warning for callers in this module
• Fix GitHub workflows
• Decide if JDK23 or JDK24 should be used --> JDK24 is it
  • Windows build currently does not work with JDK24
  • Think of change JDK to ZULU - due to [JDK 24] Provide JMODs as a separate download for deployment tool compatibility adoptium/adoptium-support#1271 (comment) - and the nice answer at https://stackoverflow.com/a/61341942/873282.

Closes https://github.com/JabRef/jabref-issue-melting-pot/issues/867

Done:

• Remove depdencies logic -> UI
• Rewrite gradle build to kotlin
  • use of plugins for antlr and XJC (instead of custom plugins)
• Fix "imports" for JavaDoc only
• Fix direct calls to tinylog (by replacint to SLF4J)
• Updates to JDK24
• Fix *.fxml and *.css treated as resources not as Java source

Removed:

• Eclipse config, because unmaintained
• JDK-EA build - we need to adapt the workflow to use the maven-builds (which are available again):
  

Direct follow-up

• Update crowdin configuration -> Add Crowdin action #13007
• Make Unit testst mandatory (in branch protection)
  • old:
  • new:
• Fix Modernizier issues (add issue as high-prio follow-up)

Future work

(Moved to internal issue tracker https://github.com/JabRef/jabref-issue-melting-pot/issues/879)

• Get to run: checkstyle, modernizer, openrewrite, jacoco, openfasttrace
• Separate JabKit from JabGui: Currently, the GUI can do "--nogui", which should be removed. Aim: there is one CLI for Text-based-CLI and tweaking GUI - this should be separated
• Documentation updates
• testFixtures for @DisabledOnCi and TreeNodeTestData
• Fix: Windows: Tests: CreateProcess error=206, The filename or extension is too long - refine Add usage of java Command-Line Argument File on Windows java9-modularity/gradle-modules-plugin#282 with test modules
• .gitignore contains Icon, because of macOS GitHub global GitIgnore file.
  
  On Windows, icon is equal to Icon and therefore folders with icon is ignored.

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Diagram for deciding on a JDK: https://stackoverflow.com/a/61337953/873282

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Mandatory checks

• I own the copyright of the code submitted and I license it under the MIT license
• [/] Change in CHANGELOG.md described in a way that is understandable for the average user (if change is visible to the user)
• [/] Tests created for changes (if applicable)
• Manually tested changed features in running JabRef (always required)
• [/] Screenshots added in PR description (if change is visible to the user)
• Checked developer's documentation: Is the information available and up to date? If not, I outlined it in this pull request.
• [/] Checked documentation: Is the information available and up to date? If not, I created an issue at https://github.com/JabRef/user-documentation/issues or, even better, I submitted a pull request to the documentation repository.

[trag-bot]

@trag-bot didn't find any issues in the code! ✅✨

[github-actions]

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