Add tracking of particle times to observation plane writer

added 1 commit

assigned to @rprechelt

added Output label

@JAlameddine Ping me when this is ready & rebased and I'll review and merge it! Some tests are failing on the CI...

added 1 commit

added 27 commits

@rprechelt The CI is working now, the PR is rebased and ready for review

The code approval procedure is described in the wiki: Code approval procedure wiki

The MR is without WIP/Draft status
Make sure the most recent CI jobs (config, quality, build_test_example) all run fine with no failures
- if "check clang-format" failed: the code contributor has to run ./do-clang-format.py --apply eventually with the --all option
- if "check copyright" failed the code contributor has to run./do-copyright.py --add=20xy
Make sure also the jobs with MR-label ready for code review succeed. This includes the optional jobs, in particular 'coverage', 'release-clang-8", "release-u-18.04" and make sure no problems occur. You may have to trigger a pipeline manually to check this.
Check in the "coverage" job output that the coverage did not decrease. It should always stay, or increase. If it decreased --> ask contributor to add further needed unit tests, and check coverage report.
On the MR page, open the "Open in Web IDE" tool
- Check if the provided solution solves the Issue, discuss on gitlab
- Check that all changes are actually related to the issue
- There are no debug statements left, not even commented out
- Check all changes for coding rules and guidelines
When all above is done:
- Add MR label "Code Review Finished"
- Approve (click button)
- Rebase, if needed. If unclear: discuss!
  - git rebase master (rebase on top of master)
  - git merge master (merge back changes from master)