Importable xacro fixes to remove duplicate root frames and fix typos

[mattalvarado]

Resolve #58 and #59

To avoid confusion this removes the origin->head transform which creates multiple root's of the MultiSense TF tree

[swiz23]

Why not delete the importable urdfs altogether? The PR in its current state would just be making the importable camera macro essentially equivalent to the camera macro itself.

[mattalvarado]

Why not delete the importable urdfs altogether? The PR in its current state would just be making the importable camera macro essentially equivalent to the camera macro itself.

Thanks for the suggestion. I figured you might have had a use case for them with the issues you were posting. I agree they are redundant, and make sense to be deleted. Updated the PR to do that.

[swiz23]

this looks good to me.