v8.27.0

ModelingToolkit v8.27.0

Diff since v8.26.1

Closed issues:

• Only force unbound causal inputs to be states (#1577)
• Custom rrule not working (#1837)

Merged pull requests:

• Show selected states in MatchedSystemStructure (#1841) (@Keno)
• Update latex ref tests (#1862) (@YingboMa)
• Define complete for hierarchical systems (#1863) (@YingboMa)
• Don't select states that were ag-eliminated (#1864) (@Keno)
• Repeated components optimization and make @named more intuitive (#1866) (@YingboMa)
• Allow find_eq_solvables! to take extra unsed keyword arguments (#1868) (@bowenszhu)
• Only force unbound causal inputs to be states (#1869) (@YingboMa)