New feature: delayed grenade explosions:

- use transformation menu to change explosion mode
- only Normal/Stun/Flashbang type grenades can be delayed
- AI soldiers will avoid staying close to armed grenades\explosives
- use option DELAYED_GRENADE_EXPLOSION to make all hand\GL grenades work as delayed
- new value AP_GRENADE_MODE = 4 in APBPConstants.ini
- new item flag DELAYED_GRENADE_EXPLOSION

Other changes:
- fixed call to sqrt in DrawExplosionWarning() that prevented compiling in VS2010
- correctly update interface after transformations
- PATHAI: AI soldiers will skip gassed tiles if not in gas already
- InGas check: AI soldiers will avoid mustard gas even when wearing gas mask
- Yellow AI: added check to avoid gas/water/bomb using FindNearestUngassedLand
- gas/flare grenades will always explode instantly even when in bad state
- LegalNPCDestination: locations near armed bombs are not legal
- FindBestNearbyCover: avoid locations near armed bombs

git-svn-id: https://ja2svn.mooo.com/source/ja2/trunk/GameSource/ja2_v1.13/Build@8324 3b4a5df2-a311-0410-b5c6-a8a6f20db521

Tactical/Items.cpp

@@ -15568,4 +15568,30 @@ FLOAT GetAttackAPTraitMultiplier( SOLDIERTYPE *pSoldier, OBJECTTYPE *pObj, UINT8
 	}
 
 	return fMultiplier;
-}
+}
+
+// check if item is grenade and it can use delayed explosion
+BOOLEAN CanDelayGrenadeExplosion( UINT16 usItem )
+{
+	// check that item is a grenade
+	if( Item[ usItem ].usItemClass != IC_GRENADE )
+	{
+		return FALSE;
+	}
+
+	// check that grenade type is not gas/smoke/fire or flare
+	if( Explosive[Item[ usItem ].ubClassIndex].ubType != EXPLOSV_NORMAL &&
+		Explosive[ Item[ usItem ].ubClassIndex ].ubType != EXPLOSV_STUN &&
+		Explosive[ Item[ usItem ].ubClassIndex ].ubType != EXPLOSV_FLASHBANG )
+	{
+		return FALSE;
+	}
+
+	// check if grenade should always explode on impact
+	if( Explosive[Item[ usItem ].ubClassIndex].fExplodeOnImpact )
+	{
+		return FALSE;
+	}
+
+	return TRUE;
+}