[Combat] Convert some status effects to the new additional effect system and clenaup previous conversions

[Xaver-DaRed]

I affirm:

• I understand that if I do not agree to the following points by completing the checkboxes my PR will be ignored.
• I understand I should leave resolving conversations to the LandSandBoat team so that reviewers won't miss what was said.
• I have read and understood the Contributing Guide and the Code of Conduct.
• I have tested my code and the things my code has changed since the last commit in the PR and will test after any later commits.

What does this pull request do?

• Converts "Curse", "Paralyze" and "Evasion Down"
• Cleanup mob scripts from all affected mobs
• Cleanup left overs from previous conversions that were missed

Steps to test these changes

Fight King Arthro or any other affected mob.