Light generating nodes

[hiveSAYSi]

I don't know how easy a screen blending mode would be to implement and how light dropoff in distance and altitude ought to be handled and whether that complicates things in crazy ways, but It would be sweet to show a light halo around the nodes that generate light, similarly to node shadows.

Super happy with the mapper! Keep up the good work, y'all!

[sfan5]

A few weeks ago I happened to implement code that renders the map roughly how it would look at night. You can find the branch with the code here: https://github.com/minetest/minetestmapper/tree/night_render