Prune trailing spaces; replace tabs with spaces

[Tc-Fast]

No description provided.

[chrbertsch]

@Tc-Fast : What is the benefit of replacing tabs with spaces? Do or should we have a formatting rule in https://github.com/modelica/fmi-standard/blob/main/CONTRIBUTING.md?

[Tc-Fast]

Modern coding conventions suggest to use only spaces and no tabs.

[chrbertsch]

Torsten: We should an CI action and have guidance how to avoid this happening again.
Pierre: one normally uses pre-commit-hooks, one could have an automated Github check
Torsten: sometimes they destroy formatting
Klaus: I would not use pre-commit-hooks ... have bad experience ...
Pierre: merge this only once we have somthing in place to prevent it in the future
Torsten: i will look into this.

[chrbertsch]

Torsten: We could include a simple Python script in the CI Pipeline

[Tc-Fast]

Added a check for trailing spaces. This check currently excludes all *.svg files, since they are generated/exported by some tool.