Fix SBML import for events with trigger functions depending on parame…

…ters that are initial assignment targets (#2145)

I.e. given the current way of processing initial assignments, events have to be processed first. Otherwise model compilation fails with `use of undeclared identifier`, because the respective parameter was replaced by its initial assignment value.

python/sdist/amici/sbml_import.py

@@ -549,9 +549,9 @@ def _process_sbml(
         self._process_species()
         self._process_reactions()
         self._process_rules()
+        self._process_events()
         self._process_initial_assignments()
         self._process_species_references()
-        self._process_events()
 
     def check_support(self) -> None:
         """