[ORL-63] Toon shader outlines w/o stencil

[daalta]

The current toon shader uses stencils to achieve its stencil effects. This effect has benefits when dealing with transparency. But it's sometimes less effective at rendering concave outlines or outlines that intersect with the mesh.

I'd appreciate being able to choose between stencil-based outlines and "traditional" outlines.

Here's a comparison between orels's toon shader and Poyomi.

Here's an example of outlines not being rendered in certain conditions:

_{From SyncLinear.com | ORL-63}

[orels1]

https://github.com/orels1/orels-Unity-Shaders/assets/3798928/62cc75e7-5af1-40d0-ae08-24ca88f0f06a

I think i got it working with a simple toggle

[orels1]

That would allow shapes that overlap each other to have stencils. I'll probably rename it to something more human readable

[orels1]

Added support for modifying outline width by vertex color. This will allow better artistic control