Simulates a high quality pencil-style hand-drawing effect

the effect provides several adjustments including:
* 3 methods (diiferent detail/color schemes different performance) * continuous fade effect
* adjust brightness/contrast of source
* color adjust -> (color/bw)
* separarte adjustment of outlines/hatch intensity
* hatch scale
* vignetting of both content (to paper color) and final image (to black)
* setting custom paper texture
* NEW!! - now also supports HDRP

(HDRP is disabled by default due to compatibility - see Readme on how to easily enable it)