Current bonus level should be maintained through Game Over

[aarontabor]

Bonus level configurations are read from an input file. The configurations are simply cycled through, but every time a game over occurs, bonus level configurations begin from the beginning of the file again.

Proposed solution

Save the current bonus level configuration across games, so that they always cycle through in order, no matter how many times the player dies.

[aarontabor]

A fix has been pushed to the fitts_pilot branch: 33863e2

Not closing this issue until the fix makes it way into develop (or we may decide that this is not desired behavior in general)