Document not implemented code and basic implementations needing enhancement

[Copilot]

This PR provides comprehensive documentation of functions, classes, and projects that have stubs or basic implementations requiring more work in the RACEngine project.

Summary

Created detailed documentation identifying implementation status across all engine modules:

• 35 files contain TODO comments or NotImplementedException patterns
• 5 complete stub modules: Tools, Animation, AI, Networking, Scripting
• 8 modules with basic implementations that could be enhanced
• Multiple expansion opportunities in Null pattern implementations

Documentation Added

docs/development-status.md

Quick reference providing:

• Implementation status overview with visual indicators (✅⚠️❌)
• Statistics on stub vs. implemented code
• Contributor guidance for different skill levels
• Links to detailed analysis

docs/development/not-implemented-features.md

Comprehensive 241-line analysis including:

• Complete Stubs: Classes with only TODO comments (Builder, SkeletalAnimator, BehaviorTree, etc.)
• NotImplementedException Areas: Physics module advanced features (8+ gravity/collision/fluid types)
• Basic Implementations: Audio, Asset, Rendering, ECS systems needing enhancement
• Null Pattern Opportunities: Safe fallbacks that could provide debugging/logging functionality
• Priority Recommendations: High/Medium/Low priority categorization for implementation planning

Key Findings

Highest Priority Missing Features:

• Task Scheduler (critical for engine loop coordination)
• Shader System (essential for visual rendering)
• Input Mappings (required for user interaction)
• Entity Interface (fundamental to ECS architecture)

Well-Implemented Areas:

• Core ECS System with comprehensive architecture
• Configuration Management with robust builders
• Asset Management with file system and caching
• Basic OpenGL renderer with multi-phase pipeline

Educational Value:
The analysis preserves RACEngine's educational focus by categorizing learning opportunities, explaining design patterns, and providing structured paths for contributors at different skill levels.

This documentation will be updated as features are implemented and serves as a roadmap for future development priorities.

Fixes #161.

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