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Override unused state collection #46

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Both reward calculators (BlueRewardMachine and EmptyRewardCalculator) never use the current_state that is passed to the calculate_reward method. The collection of this state represents a major allocation of execution time during each timestep.

By skipping this collection, timestep execution is ~40-60% faster depending on actions and agents.

Fixes #45

Both reward calculators (BlueRewardMachine and EmptyRewardCalculator)
never use the `current_state` that is passed to the `calculate_reward`
method. The collection of this state represents a major allocation of
execution time during each timestep.

By skipping this collection, timestep execution is ~40-60% faster
depending on actions and agents.
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Performance Impact of Reward Calculators State Collection
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