Add wind barb/arrow plot for wind direction

Describe the New Feature

Derived wind speed and direction were added via PR #147. Direction is currently a contoured plot, which isn't that usable. Need to add a plot type that displays directions as either wind barbs or wind arrows.

Acceptance Testing

List input data types and sources. Describe tests required for new functionality.

Time Estimate

Estimate the amount of work required here. Issues should represent approximately 1 to 3 days of work.

Sub-Issues

Consider breaking the new feature down into sub-issues.

[ ] Add a checkbox for each sub-issue here.

Relevant Deadlines

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Define the Metadata

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Projects and Milestone

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New Feature Checklist

[ ] Complete the issue definition above, including the Time Estimate and Funding source.
[ ] Fork this repository or create a branch of develop. Branch name: feature_<Issue Number>/<Description>
[ ] Complete the development and test your changes.
[ ] Add/update log messages for easier debugging.
[ ] Add/update tests.
[ ] Add/update documentation.
[ ] Push local changes to GitHub.
[ ] Submit a pull request to merge into develop. Pull request: feature <Issue Number> <Description>
[ ] Define the pull request metadata, as permissions allow. Select: Reviewer(s), Project, and Development issue Select: Milestone as the next official version
[ ] Iterate until the reviewer(s) accept and merge your changes.
[ ] Delete your fork or branch.
[ ] Close this issue.

NCAR / wrfcloud