ctf_twindustrial a3a

The alpha 3 version of Twindustrial is here, sporting some new changes:
- Reworked layout:
-- The water in a1/a2 was too shallow to extinguish players, leading to confusion. The water is now deeper.
-- Redone main buildings, giving more opportunities for players to change floors and more hiding spots.
-- Reworked sightlines, now they should be slightly less ridiculous.
-- Central area is now a two-tiered area. Blast-jumping classes can still reach the tower at the top!
- Improved optimization

A new "Alpha 3 Alpha" has been released, with the following minor changes:
- Small signage changes
- Lighting adjustments
- Small decoration changes on the RED side.

Changes for the a2 version include the following:
- Improved lighting, things should be easier to see this time around.
- Condensed layout, many spaces that were a bit large and cumbersome to move around have been compacted.
- Changed intel location, now it's no longer right next to team spawn points (And it gives the large building near each spawn some use!)
- Changed midpoint, now features a top path for players to use and an overall simpler layout.
- Improved signage

These changes are meant to keep most of the original theme I was going for while also trying to improve some of the problems the first version had based on feedback. I'll be resubmitting this to the bot and seeing what kind of feedback I get this time!