Goldwood (Arena) a2b

Added an extra small health + medium ammo at the bottom of the jump pad
(Total now of 3 medium and 6 small healthkits)
Adjusted the geometry near the train inside the trainhouse to make the train easier to climb onto.
Blocked off a sniper sightline I didn't like from the point out the right door onto the enemy side's concrete.
Fixed some visual bugs and clipping issues.
Added some references to previous funny test events.

Extended the building near the point and moved the point into it.
Stump it used to be is gone entirely.
Made the entrances to the train house one-way dropdowns towards spawn, to let attackers take the building easier.
Added two more mediums and two more smalls, and some scattered ammo.