Add NMSM Pipeline muscle model for use in Moco

[SpencerTWilliams]

Fixes issue #<issue_number>

Brief summary of changes

This fork includes the new MeyerFregly2016Muscle, previously described in #3877.

Testing I've completed

I've successfully compiled OpenSim on Ubuntu with these changes. However, I have not been able to test using the new elements.

Looking for feedback on...

As previously said in #3877:

I ran into an error while trying to compile a test for the MeyerFregly2016Muscle by modifying testMocoActuators.cpp:

/home/compiler/opensim-workspace/opensim-core-source/OpenSim/Moco/Test/testMocoActuators.cpp:95:26: error: expected type-specifier before ‘MeyerFregly2016Muscle’
   95 |         auto* actu = new MeyerFregly2016Muscle();
      |                          ^~~~~~~~~~~~~~~~~~~~~

I had the same error if I replaced the auto with MeyerFregly2016Muscle, so I think there may be an issue with including the new muscle as a type, even though the code files for the muscle compile correctly. Are there any issues with how I included the muscle in linking or registering the type in 2063d6f?

CHANGELOG.md (choose one)

• updated.

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