Driveable Vehicles Tanks Update (by Ocular)

- New ja2_options.ini entry: TANK_MINIMUM_PROGRESS
- This defines the progress (0-100), when the enemy can use tanks for attacks and patrols

git-svn-id: https://ja2svn.mooo.com/source/ja2/trunk/GameSource/ja2_v1.13/Build@7541 3b4a5df2-a311-0410-b5c6-a8a6f20db521

GameSettings.h

@@ -773,6 +773,7 @@ typedef struct
 
 	BOOLEAN fArmyUsesTanksInAttacks;
 	BOOLEAN fArmyUsesTanksInPatrols;
+	UINT8 usTankMinimumProgress;
 
 	// WANNE: Always use "prof.dat".
 	BOOLEAN fUseDifficultyBasedProfDat;