Traintower (Revamp) a3b

Minor update, will be doing some bigger changes in a4.
-Added ambient sounds
-Changed some brushwork on some buildings
-Added some better defensive holds near C

Some spawnpoints werent enabling/disabling when they were supposed to, also changed some brushes near C.

Traintower Revamp A3 Changenotes

-Added 20 seconds to the setup timer.
-Massivly reworked the area surrounding the Final point. For now, I just modeled it based off of Upward's last lol
-Moved BLUs final spawn into the underground portion of the map, closer to C.
-Added some more areaportals near last to try and combat the poor performance people reported.
-Expanded the train tunnel for a hopefully smoother rollout from A to B for BLU, and the rollout to A for RED.
-Removed the the upper elevated train area around A.
-Added a very important sign near C.

-Shifted some buildings, barriers, and added new props and brushwork to reduce some nasty sightlines
-Moved Red's second-to-last spawn location closer to C.
-Fixed various spawnpoints not disabling at certain capture points.
-Removed some uninvited mercenaries
Overall, Im taking a less radical approach to doing each version, and Im going to try doing retests in at least both EU and US servers, to get a wider opinion.

forgot to add the game mode type to the title lol