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Steal allows you to steal up to four items from an enemy. As you probably know
from all those "Couldn't Steal Anything" messages, you are not guaranteed to
get an item when you steal.

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Step 1
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Steal has to successfully hit the target.

Atk = Random MOD (Level + Spirit)
Def = Random MOD (Enemy Level)

If Atk is equal or greater than Def, Steal is a success and moves to Step 2.
This step can be ignored if Bandit is equipped: Bandit causes any Steal to
have a 100% success rate.

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Step 2
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Checks to see if you get an item, they're 4 possible slots to choose from.

Rare : 1/256
Semi-Rare: 16/256
Uncommon : 64/256
Common : 256/256

Slots are checked from Rare to Common. If you fail to get the item in the
Rare slot it moves down to Semi-Rare, fail to get the item in the Semi-Rare
slot it moves down to Uncommon, fail to get the item in Uncommon slot and
you'll get what ever item is in the Common slot.

If you get a slot that has no item or you already stole it, Steal will fail.

If you equip Master Thief the Rare and Semi-Rare slots are changed from 1/256
and 16/256 to 32/256. Steal will also now ignore empty slots.

If you succeed in getting an item, Steal moves to Step 3.

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Step 3
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This Step deals with Mug and Steal Gil.

Mug does a random amount of damage from:

0 ... [Zidane's Level * Target's Level / 2] - 1

Steal Gil steals a random amount of Gil from:

0 ... [Zidane's Level * Target's Level / 4]