Add material control

Rendera & Rendera-Control Updates

  Rendera:

  - ⚡ Performance boost: Optimized WebGL state caching and shader uniform handling for faster rendering

  - 🔧 Better C3 compatibility: Fixed state tracking issues that caused rendering conflicts with Construct 3

  - ✅ Improved stability: Enhanced validation for WebGL objects and texture coordinates in glTF models

  - 🎨 Material swapping: New setMaterial() and resetMaterials() methods for dynamic material changes per instance

  Material Swapping Usage:

  // Change material for a specific node

  model.setMaterial("nodeName", materialIndex);

  // Reset all materials to model defaults

  model.resetMaterials();