Trading On-Demand reactor

[nsryan2]

Summary of changes

TOD is a Cyclus reactor archetype based on Cycamore's Reactor, except that it
has the ability to update the power output over time. TOD achieves this by
creating a private variable that is updated at the end of the Tock phase when
the reactor refuels. Each intervening step checks if the current time step
equals this private variable.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

Associated Issues and PRs

• Issue: #

Associated Developers

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