feat: Longus colli neck muscles

[Hamedshayestehpour]

Longus colli neck muscles have been added to AMMR4

[divyaksh-chander]

I will just add some comments:

• The reference nodes in the existing muscles (like longus capitis) are reused for making the new muscles (like superior obliques). This is a fair assumption, given that we are really working on very small bones and surfaces.
• The longus colli superior and inferior obliques don't have any via points or wrapping surfaces. The muscle path will not be realistic in large angles at the neck, where it would need some wrapping surface or such. This has not been done at the moment and could be a future improvement.

[melund]

@Hamedshayestehpour Remember to also make a PR with the muscle parameter fixes for the AMMR-data repo. 👍