Various AI improvements.

FindThrowableGrenade: allows to specify type and damage of searched grenade.
New counter SOLDIER_COUNTER_RETREAT allows to set number of turns which soldier will try to retreat and take cover.
FindBestNearbyCover: use PrepareThreatlist as unified function to make list of all known opponents.

Militia Control:
- start retreating mode for 2 turns when ordering retreat
- replace AI_ACTION_RUN_AWAY with AI_ACTION_TAKE_COVER order so that militia do not retreat from sector

New AI behavior:
- soldier can use smoke grenade to cover himself when under fire
- soldier can use use smoke grenade on his friend to cover him
- if soldier used smoke, he starts retreat mode for 2 turns
- added retreat code to Red, Black AI
- improved Main Red AI for civilians (they only run away)

Improved suppression code:
- less chance of suppression when opponent has high shock level
- prefer using suppression fire when soldier is in cover

git-svn-id: https://ja2svn.mooo.com/source/ja2/trunk/GameSource/ja2_v1.13/Build@8879 3b4a5df2-a311-0410-b5c6-a8a6f20db521

TacticalAI/AIMain.cpp

@@ -1374,7 +1374,7 @@ void ActionDone(SOLDIERTYPE *pSoldier)
 
 UINT8 SkipCoverCheck = FALSE;
 THREATTYPE Threat[MAXMERCS];
-
+UINT32		guiThreatCnt = 0;
 
 // threat percentage is based on the certainty of opponent knowledge:
 // opplist value:        -4  -3  -2  -1 SEEN  1    2   3   4   5