add maxStrenght attribute (strength can be sapped)

src/include/playerchar.h

@@ -10,6 +10,7 @@ class PlayerChar : public Mob {
 	public:
 		PlayerChar(Coord);
 		int getStrength();
+		int getMaxStrength();
 		int getArmor();
 		int getGold();
 		int getHP();
@@ -19,7 +20,7 @@ class PlayerChar : public Mob {
 		int maxDelved(); 
 	private:
 		const int START_HP=10, START_ARMOR=0, START_STR=1, START_GOLD=0, START_LEVEL=1;
-		int HP, maxHP, armor, strength, gold, level;		
+		int HP, maxHP, armor, strength, maxStrength, gold, level;		
 		ItemZone backpack;
 		bool hasFoundAmulet;
 		int maxDepth;

src/playerchar.cpp

@@ -9,6 +9,7 @@ PlayerChar::PlayerChar(Coord pos)
 	, maxHP(START_HP)
 	, armor(START_ARMOR)
 	, strength(START_STR)
+	, maxStrength(START_STR)
 	, gold(START_GOLD)
 	, level(START_LEVEL)
 	, backpack(ItemZone())