Modernize the appeance of the device in the Accelerometer panel.

[TimBarham]

The device representation in the Accelerometer panel is old and clunky looking, and isn't representative of modern devices. This change updates it to a more modern look.

Because the mesh is significantly more complex, and requires some maths to generate, I changed it to be generated at design time, creating a JSON file with the resulting mesh. For simplicity, I update the 3D library to accept a mesh array as an alternative to a string (it clones it, however, since it makes changes to its copy).

For comparison, here's a couple of shots of the old device:

And equivalent shots of the new device: