Dallas Fair Park 1984 1.0

As this track is very difficult to find nowadays, and as it exist many unfinished versions, we thought it was an idea to share the most complete and updated version possible. Also useful for GP1984 championship
CREDITS :
Original track by Niericksenna, enhanced by PhilRob, updated by Endor Team :
-new trees textures
-updated sponsors
-new sky & shadows