ItemType mult_item Change to Array

[Mochnant]

To support multiple items (and variable boost) thereof, change the mult_item,mult_val elements of ItemType to an array.

For example, a pick could provide +1 iron and an enchanted pick could provide +2 iron. Alternately, an iron hammer or a mithril hammer or admantium hammer could all provide +1 when crafting iron weapons.

Current gamedata.cpp:

// name, plural, abbr,
// flags,
// pSkill, pLevel, pMonths, pOutput, pInput array
// mSkill, mLevel, mOutput, mInput array
// weight, type, baseprice, combat, index, battleindex
// walk,ride,fly,swim,
// hitchItem, hitchwalk
// mult_item,mult_val

	{"iron","iron","IRON",
	 0,
	 S_MINING,1,1,1, {{-1,0}, {-1,0},{-1,0},{-1,0}},
	 -1,0,0, {{-1,0},{-1,0},{-1,0},{-1,0}},
	 5, IT_NORMAL, 30,0,0, 0,
	 0,0,0,0,
	 -1,0,
	 I_PICK,1},

Proposed (3 maximum, could be more if preferred):

	{"iron","iron","IRON",
	 0,
	 S_MINING,1,1,1, {{-1,0}, {-1,0},{-1,0},{-1,0}},
	 -1,0,0, {{-1,0},{-1,0},{-1,0},{-1,0}},
	 5, IT_NORMAL, 30,0,0, 0,
	 0,0,0,0,
	 -1,0,
	 {{I_PICK,1}, {I_EPICK, 2}, {-1, 0}},

[nedbrek]

Commit adb3715 adds a mult_item vector (and makes the gamedata use it) - but there is still some code that needs to be updated (the first item in the array is pulled into the original structure field - most of the code only looks at that).