ENH: Add example of OrientImageFilter

[blowekamp]

PR Checklist

• No API changes were made (or the changes have been approved)
• No major design changes were made (or the changes have been approved)
• Added test (or behavior not changed)
• Updated API documentation (or API not changed)
• Added license to new files (if any)
• Added Python wrapping to new files (if any) as described in ITK Software Guide Section 9.5
• Added ITK examples for all new major features (if any)

Refer to the ITK Software Guide for
further development details if necessary.

[blowekamp]

Sample output:

$ bin/OrientImageFilter ExternalData/Testing/Data/Input/HeadMRVolume.mha test.mha RAS
Input image direction: 
  Matrix (3x3)
    1 0 0 
    0 1 0 
    0 0 1 
The input image has the following orientation: 
	right-to-left anterior-to-posterior inferior-to-superior
The re-orienting to approximately the desired orientation: 
	left-to-right posterior-to-anterior inferior-to-superior

Do we have any existing testing data that is 3D with an interesting matrix?

[hjmjohnson]

@blowekamp I am approving as is because this represents a sufficiently beneficial example.

I agree that it would be better to have a test case with an interesting matrix.

[dzenanz]

Good even as-is.

[dzenanz]

We could simplify this by using itk::WriteImage(orienter->GetOutput());

[N-Dekker]

• Minor suggestion: you may replace OrientImageFilterType::Pointer with auto here! No need to wait for a follow-up to Modernize initialization of local SmartPointer variables #4964 (comment) 😃

[thewtex]

Nice!