Adds rotation arg to magpie

[jlashner]

Adds an argument to magpie that lets you set a wafer's rotation about its center.

Motivation and Context

Necessary for bringing up a focal-plane in lyrebird

How Has This Been Tested?

Tested locally with fake data.

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 not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• Unless I am preparing a release, I have opened this PR onto the develop branch.

[BrianJKoopman]

Looks good to me!