Added workshop url.

Fixed a nav issue on a couple of maps. Had missed a checkpoint square on map 2 and sometimes one of the bots would spawn outside the saferoom because of it. Replaced a couple of over bright textures in map 8. Fixed some gun spawns that were acting wrong. Good to go.

Had too many windows open last night and accidentally typed some characters in the mission file. Removed them and campaign is good to go now. Sorry about that.