Fixed TAA bugs

Use more efficient algorithm (in doc/main_en.pdf) to create a better denoiser. Now the scene is more realistic!

Make atmosphere rendering more faster

Less noisy image

better shadow

improved image quality

fixed many bugs

fixed some bugs

cleaner image

Fixed a SEIROUS BUG on NVIDIA driver version 551.23

Added more settings and improved some qualities

Add clouds (ugly)

fixed some bugs and improved image detail