New Feature: static fortifications can now be built by mercs (by Flugente)

- if the terrain allows it, an empty sandbag (item 1540) can be filled to a full sandbag (item 1541). You need to have a shovel (item 1015) in your second hand. You will notice the new hammer cursor
- by using a full sandbag, you can build a sandbag barrier
- by using a concertina stack, you can build a concertina wire barrier
- this only works if the current map has sandbags/concertina wire in its tileset
- with a shovel in your hand, you can remove a sandbag barrier
- changed the size of shovel so it can actually be put in inventories. It was also necessary to remove its ability to be used as a melee weapon.
- for further info, see this thread: http://www.bears-pit.com/board/ubbthreads.php/topics/305822.html#Post305822


git-svn-id: https://ja2svn.mooo.com/source/ja2/trunk/GameSource/ja2_v1.13/Build@5340 3b4a5df2-a311-0410-b5c6-a8a6f20db521

GameSettings.h

@@ -372,6 +372,7 @@ typedef struct
 	BOOLEAN fZombieCanClimb;
 	BOOLEAN fZombieExplodingCivs;
 	INT8	sEnemyZombieDamageResistance;
+	INT8	sEnemyZombieBreathDamageResistance;
 	BOOLEAN fZombieOnlyHeadshotsWork;
 	INT8	sZombieDifficultyLevel;
 	BOOLEAN fZombieRiseWithArmour;