Generalize whitelists and make stage specific

[DaJansenGit]

Currently, the existing whitelists are already stage specific:

• ci_check_whitelist.txt
• ci_html_whitelist.txt
• ci_simulate_whitelist.txt

But this is not generalized. We should change this and allow a whitelist for every stage if it makes sense. E.g. Style-check could also have a whitelist as well as regression testing.

Also the creation and update of each of the whitelists should be combined into single stages. So we end up with two stages:

• update whitelists
• create whitelists