Rewrite Credits

[erikroe]

The mod's credits file is completely outdated and by its incompleteness actually violates our own terms of usage of contents. What is to do:

• Identify all names of people who in direct or indirect way found their works or even just help and hints to be used in the mod
• Try to nail down precisely what those things were if it is possible The actual mod features list of the current file isn't necessary to keep.