Add angular and time dependence to weight windows

[nglaser3]

Summary of changes

This PR adds angle and time dependence to the weight window implementation.

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)
• Organization and beautification (changes which improve readability and/or accessibility)

Developer Checklist

• I have read the contributing guide.
• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests pass

Associated Issues and PRs

• closes [Feature] Angle and time dependence for weight windows #410
• related to [Feature] Mesh-based weight windows #393, Mesh-based weight windows #394

Associated Developers

• Dev: @ilhamv

[ilhamv]

Should we add a 3d vector parameter polar_reference, with default value [0.0, 0.0, 1.0]?

[ilhamv]

Currently, this is supported only in tally. It would be great if we could add support for adjustable polar reference for this WW. Perhaps also in the source as well, later.

[nglaser3]

I am not sure I am following, is this to generalize the conversion from ux, uy, uz to theta/phi?