Grant users the ability to change the maximum amount of credits available rather than the constant cap at 20.
(cherry picked from commit 2ec2355d7a7d9fec9410cf6b7d2b5c31a4406074)
(cherry picked from commit 48245ab51600ede16096e70e27c94345918eaed7)
On Coin Insert, a file Save/Coin.ini is created if it does not exist, which stores the number of coins currrently in m_iCoins. Whenever m_iCoins is update, the Coin.ini is updated.
On boot, Coin.ini is read and m_iCoins is set to that value. If coins in coin.ini file is greater then MAX_NUM_CREDITS then reset the value to 0.
dando92