Persistent Tire Tracks

Adds persistent tire tracks that remain visible after saving and loading the game. Tracks are automatically restored when the savegame is loaded.

Features:

• Improved fieldwork cleanup system
• Batch based cleanup processing to reduce CPU usage
• Reduced FPS impact from frequent terrain scanning
• Optimized refresh and replay performance
• Enhanced handling of cultivated, plowed, seeded, and rolled field areas
• Prevention of persistent tire tracks over active fieldwork areas
• Temporary fieldwork suspension during terrain modification
• Improved memory management for large track databases
• Reduced workload on density map update callbacks
• General stability and performance improvements
• Note: Some old tire tracks may still reappear on recently cultivated terrain
• Future improvements planned for fieldwork area detection