Add another optimized Big Money variant

[spixi]

Hi rspeer,

after some try-and-error I found a Big Money variant, which is superior to BankWharf unless in Colony/Platinum games.

Bank + Ill-Gotten Gains work very well together.

{
name: 'BankIGG'
author: 'Spixi'
requires: ['Bank','Ill-Gotten Gains']
gainPriority: (state, my) -> [
"Colony" if my.countInDeck("Platinum") > 0
"Province"
"Duchy" if state.gainsToEndGame() <= 4
"Estate" if state.gainsToEndGame() <= 2
"Ill-Gotten Gains" if state.countInSupply("Curse") >= 1
"Bank"
"Platinum"
"Gold"
"Silver"
"Copper" if state.gainsToEndGame() <= 3
]
}

What do you think about this strategy? Should we include it to the predefined strategies?