TrueLightFX v5.1.2 - Compatibility & Color Hotfix

Fixes for Compatibility of Older Game Versions

• Fixed a shader compilation crash (endCol undeclared) on older Iris and OptiFine versions by converting relative include paths to absolute paths and ensuring End color variables are declared globally.
• Fixed a pipeline crash (Non [a-z0-9/._-] character in path) on older Iris versions by converting uppercase Prismarine block IDs to lowercase in block.properties.
• Restored original End dimension color parameters (END_R, END_G, END_B, END_I) in settings.glsl to bring back the intended blue-violet look instead of red.