Add a credits button or show credits in some way

[Luadih]

Description

The most readable way I can imagine because of C4D's UI, would be to create a new null with string userdata, in which the name of the person credited would be the name of the userdata and the value of the string would be what they are credited for or a comment of the person credited if they want it.

Acknowledgments

• [X] I have written a concise and meaningful title.
• [X] I have searched the existing issues and this new issue is not a duplicate of any.
• [X] I am helping with developing UNITE and talked with everyone about this.

[Luadih]

started implementation with 6184e0b736ac90342416d9f1011a497218ce9869

[Luadih]

Finished implementation in 1831de873a077050cd9588e1af365a4c4a263835