-fixed survival and is now using the middle rocket version of the map due to navmesh adaptations for it

a quick fix for the survival map, will be converted to using the middle rocket version of the map in a later update!

-added a version of the map for campaign that has the rocket in the middle for "easier" gameplay for some players (available in the chapter select area when selecting gm_flatwhat)

this update goes to try and fix the overpopulation of infected within the map, these are the major changes done to flatwhat

-reduced the manual spawners to only 3
-added surprise for every time you build a piece of the rocket
-navmesh (attempted) improvements

i may add a version of the map where the rocket is also in the middle of the map too, we'll see