ArtisGL 4.0.3 rendering improvements

ArtisGL 4.0.3 includes rendering improvements

* PCSS Shadows (3 levels)

* Updated algorithm for standard soft shadows

* Fast shadows mode (hard edges)

* Better and faster Ambient Occlusion and Bloom

* Detailed specular calculation for area lights

* Noised flat mirrors and normal map based flat mirrors (in fact if normal map is present, flat mirror will use normal map to distort reflection)

See the demos

Short tutorial

Finally, the work in progress