Consider removing panda3d dependency?

[mogres]

Use Case

Our current default packing method spheresSST does not require panda3d which adds extra overhead and error messages during import.

Running a test recipe after disabling panda3d (by commenting out lines of code where it was used) resulted in a speedup of ~30%. This can be significant when generating a large number of packings.

Solution

Remove functions and imports that rely on panda3d. Currently, there is some code that uses it for real time display which is no longer an available feature.

Alternatives

Only remove panda3d from the spheresSST workflow while still keeping it in other places if needed.