v9.18.0

ModelingToolkit v9.18.0

Diff since v9.17.1

Merged pull requests:

• refactor: directly solve initialization problem in linearization_function (#2762) (@AayushSabharwal)
• Better over-determined tearing (#2793) (@YingboMa)
• refactor: use common implementation of observedfun (#2796) (@AayushSabharwal)
• Bye bye ₊, use var symbols with . (#2798) (@ChrisRackauckas)

Closed issues:

• providing updated op to linearization_function has no effect (#2784)
• Initialization is incomplete without a u0, despite passing guesses (#2788)