#10 Updated DATA_AUTHORS.txt

[Tobias Frost]

Hi Trigger folks!

There are some attributions missing in the DATA_AUTHORS.txt, so I extracted the copyright owners from the level description and tried to find licenses with limited success:

Maps: GreenGrounds, Mountain Pass (note, WhiteSands is not in the SVN)
Reference:
https://sourceforge.net/p/trigger-rally/discussion/527953/thread/94d90f4f/

However, for the others I could not find any references, but I guess you'll know them ;-)

Patch attached with the information I've been able to collect so far.

--
tobi