Merge pull request #5950 from Neerti/turret_fix

Fixes turrets, AI shooting, and makes mob AI shooting a little smarter.

code/modules/projectiles/projectile.dm

@@ -313,7 +313,7 @@
 	originalRange = range
 	fired = TRUE
 	if(hitscan)
-		process_hitscan()
+		. = process_hitscan()
 	START_PROCESSING(SSprojectiles, src)
 	pixel_move(1, FALSE)	//move it now!
 

code/modules/projectiles/projectile/trace.dm

@@ -1,4 +1,5 @@
-//Helper proc to check if you can hit them or not.
+// Helper proc to check if you can hit them or not.
+// Will return a list of hit mobs/objects.
 /proc/check_trajectory(atom/target as mob|obj, atom/firer as mob|obj, var/pass_flags=PASSTABLE|PASSGLASS|PASSGRILLE, flags=null)
 	if(!istype(target) || !istype(firer))
 		return 0