Manually set the indexed values for balances and avoid using loops

[Ryanmtate]

https://github.com/tokenio/tokeninc-smart-contracts/blob/df35f925609b21a202d37eacad28d05d6ea6149f/contracts/TokenIOStorage.sol#L421

@RostyslavBortmanAdoria

If we know the size of the array, we may want to manually set the indexed values. For loop setup costs ~20k gas from my understanding. This would further reduce the cost.