Blur edge option (post-beta)

[Pllecours]

Ajouter un blur edge option pour adoucir les contours des symboles

[evanmtp]

This might be a bit tricky - if we want to only blur the (outer) edges, we would need to have a way to generate a mask to specifically define the region we want to blur. We would also need to scale the planes up a bit so that the outer edges of blurred areas don't get chopped off harshly by running into the edge of the plane.

@Pllecours , could you please give a bit more info about the rationale for this?