Add better duplicated tool check

- Fix disappearing keys when the backpack was full
- Localize added tool
- Add message where the tool got dropped
- fnc_freeBackpackSlots handles also bigger inventory objects with more as one slot

SQF/dayz_code/compile/fn_freeBackpackSlots.sqf

@@ -0,0 +1,41 @@
+local _bag = unitBackpack player;
+local _freeSlots = 0;
+
+if (!isNull _bag) then {		
+	local _type = typeOf _bag;
+	local _maxMagazinesBag = getNumber(configFile >> "CfgVehicles" >> _type >> "transportMaxMagazines");
+	
+	if (_maxMagazinesBag < 1) exitwith {};	//	Fail safe
+	
+	local _cargoMagazinesBag = getMagazineCargo _bag;
+	local _cargoWeaponsBag = getWeaponCargo _bag;
+	local _weaponsBag = getWeaponCargo _bag select 0;	
+	local _magazinesBag = getMagazineCargo _bag select 0;
+	local _qtyMaxBag = 0;
+	
+	{
+		local _magazine = _x;
+		local _qtyMagazine = (_cargoMagazinesBag select 1) select _foreachIndex;
+		local _magazineInvType = getNumber(configFile >> "CfgMagazines" >> _magazine >> "type");
+		if (_magazineInvType > 16) then {_magazineInvType = _magazineInvType/256};
+		_qtyMaxBag = _qtyMaxBag + (_magazineInvType*_qtyMagazine);
+	} foreach _magazinesBag;
+	
+	{
+		local _weapon = _x;
+		local _qtyWeapon = (_cargoWeaponsBag select 1) select _foreachIndex;
+		local _weaponInvType = getNumber(configFile >> "CfgWeapons" >> _weapon >> "type");
+		
+		call {
+			if (_weaponInvType == 1) exitwith {_qtyMaxBag = _qtyMaxBag + (10*_qtyWeapon);};
+			if (_weaponInvType == 2) exitwith {_qtyMaxBag = _qtyMaxBag + (5*_qtyWeapon);};
+			if (_weaponInvType in [256,4096]) exitwith {_qtyMaxBag = _qtyMaxBag + _qtyWeapon;};
+		};
+	} foreach _weaponsBag;	
+	
+	if (_qtyMaxBag < _maxMagazinesBag)	then {
+		_freeSlots = _maxMagazinesBag - _qtyMaxBag;
+	};
+};
+
+_freeSlots