Optix: Support mouse picking

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Original report (archived issue) by Ian Chen (Bitbucket: Ian Chen, GitHub: iche033).

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Add a function that lets user pass in x, y coordinates in screen and returns the name / ID of selected entity in the scene

Ogre implementation:

• port gazebo's selection buffer and offer a function similar to gazebo's Scene::VisualAt

Optix:

• TBD

[osrf-migration]

Original comment by Javier Iván Choclin (Bitbucket: Javier Choclin).

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• set assignee_account_id to "557058:2279399d-3c75-4e1e-b818-4fb8339b2939"
• set assignee to "JChoclin (Bitbucket: JChoclin)"

[osrf-migration]

Original comment by Javier Iván Choclin (Bitbucket: Javier Choclin).

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Addressed in PR #50

[osrf-migration]

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

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• changed state from "new" to "resolved"

[osrf-migration]

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

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• changed state from "resolved" to "open"

re-opening issue for optix

[osrf-migration]

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

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• set component to "optix"
• changed title from "Support mouse picking" to "Optix: Support mouse picking"

[osrf-migration]

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

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• Edited issue description