Added support for installing GDM theming on Ubuntu

- From now GlobalTheme use another method to check does GDM support light/dark mode or not
- Structurized GlobalTheme methods
- Lowered Python version from 3.12 to 3.10

install.py

@@ -45,4 +45,5 @@ if __name__ == "__main__":
     try:
         main()
     finally:
-        shutil.rmtree(config.temp_folder, ignore_errors=True)
+        pass
+        # shutil.rmtree(config.temp_folder, ignore_errors=True)