Oil Painting

Simulates a high quality oil painting style with following features:
* continuous fade effect
* adjust brightness/contrast of source
* specular/diffuse lighting
* adjustible light direction
* adjustible canvas roughness
* vignetting of both content (to paper color) and final image (to black)
* ...and various more parameters to control detail/style
* y-flip fixes
* NEW!!! now supporting HDRP render pipeline
(HDRP is disabled by default due to compatibility - see Readme on how to simply enable it) * Very NEW!!! now supporting URP render pipeline
(URP is disabled by default due to compatibility - see Readme on how to simply enable it)