Export individual rigid body transforms

[J.D. Laurence-Chasen]

It would be nice to have an "export RB transformation" in the individual RB settings window. This came up when I added a virtual point to one RB and needed and only needed those data.

[Benjamin Knorlein]

fixes #62 : Single Rigid bodies and 3D points can be exported via a 2nd mouse click in the pointlist

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