Changes

• 67136803 Issue #364: update to Checkstyle 10.3.4
• e121d641 ci: fix warnings in maven console
• 99102020 Issue #393: Sort available modules alphabetically
• a7e9f47c supplemental: fix all Eclipse IDE warnings
• 3a753796 Issue #391: disable context help
• ff367adf ci: replace tycho-source-feature-plugin
• 3522eb69 Issue #304: Use shared PNG icons
• 9ca7b7b4 Issue #362: remove outdated jars
• cc490697 Issue #351: Store our own checkstyle settings
• 579b2434 Update installation instructions.

Please read the Checkstyle release notes for details on recent and potentially breaking changes in Checkstyle. Checkstyle configuration files potentially need to be adapted to this version.