I've been working some more on the raysnail, lots of basic 
infrastructure to do, little to show. I could extend the compatibility 
with PovRay scene files a little bit, CSG intersections and differences 
are supported now, even if only with two objects each.

The translate operation should work, rotate only for the y axis (the 
other two axes soon to be supported too).

The parser now supports finish blocks, but only reads the reflection 
item from it, the basic variant with just a float.

The attached render was created with this SDL file:
https://github.com/Varkalandar/raysnail/blob/72908892fba87898477324814a5515207d8b8755/sdl/csg.sdl

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