[0.1.9] Save user settings

Added

• Add the settings.ron file, which stores all basic information about the game settings
• Create temporary/settings.ron which contain instance of user settings. It's been created only once when it's absent.
• Read from settings to start the game with correct audio settings.

Removed

• Disable TutorialPlugin for now because it has a bug that is described in the same file.
  The tutorial should be turned on when the game is upgraded to [email protected] version

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