Updates the Checkstyle core to version 8.19.

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.

Changes

• #145 Update to Checkstyle 8.19
• #153 NPE in rule filter
• #156 Focus name field in configuration editor
• #157 Select newly created configurations
• #150 Add documentation for "files older than a day" filter
• #167 Rely on the column char index to find correct marker start
• #110 Hint with rule name for suppression