Added the navmesh to gm_fullstruct_blue as the maps are functionally the same.

I'm dumb, I didn't replace the navmesh file in the previous update, it was the same as the old one; this is the updated one now.

Added some nav meshes to the skybox but some areas in it are still missing; damn you nav_generate_incremental !

Added nav meshes to the interior of the buildings with doors.

Did nav_analyse as i had forgotten to run it.