More consistent and robust, with a fresh coat of paint

This release focuses on improving the internal workings of the card, making it more robust and easier to maintain. It also includes some minor bug fixes and improvements.

Features [#21]

• Refactored slope and lift count properties:
  • Renamed slopes_open to slopes_open_count and lifts_open to lifts_open_count for better clarity.
  • Added fallbacks for the old property names to ensure backward compatibility with existing configurations.
• Improved handling of total slopes and lifts:
  • slopes_total_km and slopes_total are now correctly handled as attributes of their respective _open entities, rather than as standalone entities.

Bug Fixes

• Fixed various build, linting, and test issues that arose during the refactoring.

Other

• Updated all translation files with new localization keys.