Merge branch 'alignment' into 'master'

Workaround for __BIGGEST_ALIGNMENT__ on Clang

See merge request walberla/walberla!458
35 jobs for master in 222 minutes and 59 seconds (queued for 3 seconds)
latest
Name Stage Failure
failed
mac_MpiOnly Test
$ python3 cmake/ctest2junit.py build > report.xml
Uploading artifacts for failed job
Uploading artifacts...
Runtime platform
arch=amd64 os=darwin pid=9965 revision=unknown version=13.2.0
report.xml: found 1 matching files and directories

python/report.xml: found 1 matching files and directories

Uploading artifacts as "junit" to coordinator... ok
id=584333 responseStatus=201 Created token=Hxc3989B
Cleaning up file based variables
ERROR: Job failed: Process exited with status 1