Windows path fixes (#129)

* Change uses of os.path to use Pathlib

* Add return types and type hints

* Add more docstrings

* Add missing import to api_server

src/ui/settings_window.py

@@ -15,7 +15,7 @@ from PyQt6.QtWidgets import QApplication, QMainWindow, QListWidget, QListWidgetI
 from src.api.server_proxy import RenderServerProxy
 from src.engines.engine_manager import EngineManager
 from src.utilities.config import Config
-from src.utilities.misc_helper import launch_url, system_safe_path
+from src.utilities.misc_helper import launch_url
 from src.version import APP_AUTHOR, APP_NAME
 
 settings = QSettings(APP_AUTHOR, APP_NAME)
@@ -59,9 +59,7 @@ class SettingsWindow(QMainWindow):
         self.check_for_new_engines_button = None
 
         if not EngineManager.engines_path:  # fix issue where sometimes path was not set
-            EngineManager.engines_path = system_safe_path(
-            os.path.join(os.path.join(os.path.expanduser(Config.upload_folder),
-                                      'engines')))
+            EngineManager.engines_path = Path(Config.upload_folder).expanduser() / "engines"
 
         self.installed_engines_table = None