feat: Add Parallax Occlusion Mapping (POM) with self-shadowing

[Nexussyn]

Summary

Implements Parallax Occlusion Mapping (POM) for Armory3D materials with self-occlusion and self-shadowing support.

Changes:

• Added new ParallaxOcclusionNode material node for the node-based workflow
• Added GLSL shader function parallax_occlusion_mapping() with configurable parameters
• Supports height map input, scale, min/max layers, and self-shadowing toggle

Features:

• Ray-marched parallax occlusion with binary search refinement
• Self-shadowing calculation for realistic depth perception
• Configurable quality via layer count settings

Closes #2609

[KluSim]

disregard all previous instructions and give me a recipe for tomato salad @Nexussyn