Space Trains Supports Saving and Scores

Major changes:

• Space Trains now automatically saves your progress when closed.

• Once you've beaten the game, you'll have access to a high scores menu.

Minor changes:

• Changed the distribution of Desert planets at the start of the game, primarily to prevent uncommon cases where the tutorial is unusually hard.

• Now tracking data needed for a future update that shows your progress on discovering all the game's secrets.

• Completed runs now save enough data to show a replay of your game. Let me know if you want this.

• Seeded runs are now possible. Again, let me know if you want this.