Write the log as binary

Instead of trying to decode these bytes, why not just write them directly to the log file?
Also I'm adding stderr at the end now, after 3 newlines, because maybe it's useful sometimes.

addon/types/model_export/model.py

@@ -285,7 +285,7 @@ def compile_qc(self):
                 code = pipe.returncode
                 if code is None:
                     log = self.directory.joinpath(f'{self.stem}.log')
-                    log.write_text(pipe.communicate()[0].decode('unicode-escape'))
+                    log.write_bytes(b'\n\n\n'.join(pipe.communicate()))
                 else:
                     break