Setup to be able to train the 3D model

[svenssona]

We need to create a new custom dataset to be able to train the 3D model.
Why we also need a new Skeleton model that matches our new keypoints.

[svenssona]

Added runningpose_dataset by commit: f5d47a5
Still missing Skeleton model.

[svenssona]

Fixed by commit: 3e4c2dd