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

Tactical/Soldier Control.h

@@ -220,6 +220,7 @@ enum
 	MERC_TAKEBLOOD,
 	MERC_ATTACH_CAN,
 	MERC_FUEL_VEHICLE,
+	MERC_BUILD_FORTIFICATION,
 };
 
 // ENUMERATIONS FOR THROW ACTIONS
@@ -1240,6 +1241,8 @@ public:
 	void EVENT_SoldierBeginAttachCan( INT32 sGridNo, UINT8 ubDirection );
 	void EVENT_BeginMercTurn( BOOLEAN fFromRealTime, INT32 iRealTimeCounter );
 
+	void EVENT_SoldierBuildStructure( INT32 sGridNo, UINT8 ubDirection );		// added by Flugente
+
 	BOOLEAN EVENT_InternalGetNewSoldierPath( INT32 sDestGridNo, UINT16 usMovementAnim, BOOLEAN fFromUI, BOOLEAN fForceRestart );
 	void EVENT_InternalSetSoldierDestination( UINT16	usNewDirection, BOOLEAN fFromMove, UINT16 usAnimState );
 	void EVENT_InternalSetSoldierPosition( FLOAT dNewXPos, FLOAT dNewYPos ,BOOLEAN fUpdateDest, BOOLEAN fUpdateFinalDest, BOOLEAN fForceDelete );