[Map Update] cp_hadal_b13a

Currently running cp_hadal_b9a

https://tf2maps.net/threads/hadal.26281/

Changelog since b9a

1. b13a
   (quickfixes)
   -removed invisible geometry
   -clipping
   -other small visual issues
   
   **saving other feedback for later**
   fubarFX, Nov 27, 2016
   
   
2. b13
   -longer final point capture time
   -modeled last point platform
   -modeled spawn submarine
   -artpassed B to C connector
   -added soundscapes
   -reworked skybox
   -updated overview map
   -various aesthetic tweaks
   fubarFX, Nov 22, 2016
   
   
3. b12
   -redesigned area connecting B to C
   -combined 2 paths leading from E into B to C connector
   -removed one path leading into upper area at E
   -redimensioned the area around E to be larger
   -many areas surrounding E have been slightly lowered to avoid unneeded height differences
   -more blue spawn detailing
   -detailing for A to B connector
   fubarFX, Nov 5, 2016
   
   
4. b11
   -redesigned red spawn
   -redesigned blu spawn
   -redesigned A>B connector
   -redesigned A control point