Changes

• fef05965 upgrade to 10.6.0
• 91125ddc Infra: re-enable tycho jgit timestamp provider
• ecde1bf1 Infra: declare all DTDs with checkstyle.org
• d4004d72 Issue #492: abort opening more module dialogs after cancel
• 1f6cbd57 remove reexports of checkstyle core library
• df8c02c0 have progress icon for checkstyle jobs
• d44c3df4 Issue 467: Avoid property page for runtime error marker
• 33450984 Infra: Avoid exception when launching runtime

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.