Remaining tests for the new Rust solver

[stfnp]

Continuation of #276

• Test damping ratio for an example beam and use same logic as in bow limb
• Tests for draw length and pivot point in different configurations
• Add tests for HandleRef in combination with LayerAlignment
• Add tests for static and dynamic progess (ensure values between 0 % and 100 %)
• Check if the timespan factor is calculated with respect to the actual resting string position
• Check for symmetry errors in the model (*2, /2)
• Go over all error types and check if there is a test for them if it makes sense
• Have a closer look at the test coverage results and add tests where it makes sense
• Write section stiffnesses to the results and check relation between strains and forces
• Re-simulate user bows where the results didn't match well previously