Analytical area lights - Linearly Transformed Cosines

[Contingencyy]

https://learnopengl.com/Guest-Articles/2022/Area-Lights
https://eheitzresearch.wordpress.com/415-2/
https://drive.google.com/file/d/0BzvWIdpUpRx_d09ndGVjNVJzZjA/view?resourcekey=0-21tmiqk55JIZU8UoeJatXQ

• Implementation for Linearly Transformed Cosines to evaluate irradiance from area lights
• Rectangular area lights implemented
• Render area lights in world
• FIXED: Rotating area lights breaks the lighting (probably because of the 4 points being out of order)
• FIXED: Area light is not rendered from both sides (no back-face culling)
• LTC LUT textures should be calculated by my own code instead of using the precalculated ones
• Rectangular area lights can be textured
• Area lights properly interact with clear-coat layers