Use ign-common Image pixelformats

[osrf-migration]

Original report (archived issue) by Nate Koenig (Bitbucket: Nathan Koenig).

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PixelFormats are defined both in ignition::common::Image and ignition::rendering::PixelFormats.

For consistency, it would be nice to use the version in ignition common. This will also help ignition::msgs.

[osrf-migration]

Original comment by Louise Poubel (Bitbucket: chapulina, GitHub: chapulina).

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There is a related issue on ign-msgs:

https://osrf-migration.github.io/ignition-gh-pages/#!/ignitionrobotics/ign-msgs/issues/10/move-image-pixelformat-here-to-remove (gazebosim/gz-msgs#10)

[osrf-migration]

Original comment by Ian Chen (Bitbucket: Ian Chen, GitHub: iche033).

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I'll port the changes back to common and remove these classes in ign-rendering

[osrf-migration]

Original comment by Nate Koenig (Bitbucket: Nathan Koenig).

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• Edited issue description