Translucency Sorting With Quad Splitting

[douira]

Fixes translucency sorting for geometry that is intersecting or otherwise unsortable by splitting quads in the partition-tree. Also fixes an old mistake in the sort triggering code in the form of a wrong equals implementation on AlignableNormal.

A 1.21.1 version of this patch is available at https://github.com/douira/sodium/tree/1.21.1/translucent-quad-splitting

Fixes #2943

• Configuration option
• Remove dev and debug info
• Limit to how much geometry it can add (factor of 2x or 3x probably enough)
• Compare meshing time with/without quad splitting enabled

[jellysquid3]

Also fixes an old mistake in the sort triggering code in the form of a wrong equals implementation on AlignableNormal.

Would it make sense to pull this patch out of this pull request so we can backport it? I'm not sure what it is breaking exactly.

[douira]

It does break things that require sort triggering on unaligned normals but it's unlikely anyone would notice unless the geometry is particularly weird. It only becomes more noticeable with this patch because previously the partition tree wouldn't generate unaligned partition (i.e. triggering) planes, and unaligned trigger planes were only generated by the super rarely used dynamic topo sorting mode.

I could split it out if you'd merge such a fix before 0.7, which is when I'd expect this to be ready for as a whole.

[muzikbike]

Does this fix #2943? May be worth marking as such if so.