Add Settings Configuration System

[dmccoystephenson]

Description

Implement a system to manage and persist game settings.

Tasks

• Create Settings class to store game configuration
• Implement JSON/YAML configuration file handling
• Add default settings values
• Create methods for saving/loading settings
• Implement settings validation
• Add error handling for corrupt settings files

Acceptance Criteria

• Settings are saved to disk
• Settings load correctly on game start
• Invalid settings fall back to defaults
• Settings changes are immediately applied
• Settings persist between game sessions