[ModelicaSystem] prepare OMCPath (#330)

* [ModelicaSystem] do not use package csv

background: if OMCPath will be used, it is not available

* [ModelicaSystem] create override file using pathlib.Path.write_text()

background: open() is not available if OMCPath is used

* [ModelicaSystem] update handling of override file

* define file name based on result file name & Path
* simplify code

---------

Co-authored-by: Adeel Asghar <adeel.asghar@liu.se>

Author: syntron

OMPython/ModelicaSystem.py

@@ -33,7 +33,6 @@
 """
 
 import ast
-import csv
 from dataclasses import dataclass
 import logging
 import numbers
@@ -965,16 +964,17 @@ def simulate_cmd(
         if simargs:
             om_cmd.args_set(args=simargs)
 
-        overrideFile = self._tempdir / f"{self._model_name}_override.txt"
         if self._override_variables or self._simulate_options_override:
-            tmpdict = self._override_variables.copy()
-            tmpdict.update(self._simulate_options_override)
-            # write to override file
-            with open(file=overrideFile, mode="w", encoding="utf-8") as fh:
-                for key, value in tmpdict.items():
-                    fh.write(f"{key}={value}\n")
+            override_file = result_file.parent / f"{result_file.stem}_override.txt"
 
-            om_cmd.arg_set(key="overrideFile", val=overrideFile.as_posix())
+            override_content = (
+                    "\n".join([f"{key}={value}" for key, value in self._override_variables.items()])
+                    + "\n".join([f"{key}={value}" for key, value in self._simulate_options_override.items()])
+                    + "\n"
+            )
+
+            override_file.write_text(override_content)
+            om_cmd.arg_set(key="overrideFile", val=override_file.as_posix())
 
         if self._inputs:  # if model has input quantities
             for key in self._inputs:
@@ -1432,9 +1432,10 @@ def _createCSVData(self, csvfile: Optional[pathlib.Path] = None) -> pathlib.Path
         if csvfile is None:
             csvfile = self._tempdir / f'{self._model_name}.csv'
 
-        with open(file=csvfile, mode="w", encoding="utf-8", newline="") as fh:
-            writer = csv.writer(fh)
-            writer.writerows(csv_rows)
+        # basic definition of a CSV file using csv_rows as input
+        csv_content = "\n".join([",".join(map(str, row)) for row in csv_rows]) + "\n"
+
+        csvfile.write_text(csv_content)
 
         return csvfile