v8.4.0

ModelingToolkit v8.4.0

Diff since v8.3.2

Closed issues:

• Unexplained behavior from structural_simplify (#1317)
• Dependent source in circuit (#1430)
• docs: Simulink listed among the equation-based modeling languages (#1431)
• NonlinearSystem fails with connection equations since v8 (#1442)

Merged pull requests:

• start trying to precompile ModelingToolkit better (#1215) (@ChrisRackauckas)
• Identifiability tutorial (#1243) (@iliailmer)
• Partial State Selection (#1384) (@Keno)
• CompatHelper: bump compat for JuliaFormatter to 0.22, (keep existing compat) (#1437) (@github-actions[bot])
• Fix typos in Identifiability Tutorial (#1443) (@iliailmer)
• Add connections to NonlinearSystem (#1445) (@tred0)