refactor(tess): move solid sampling to kernel

Remove local face, edge, spline, sweep, loft, and silhouette
samplers. Meshes and overlays share the kernel tolerance and edge
schedule.

src/scene/convert/mod.rs

@@ -8,4 +8,3 @@ pub(crate) mod tess;
 pub mod proxy_graphics;
 pub mod tess_util;
 pub mod solid3d_tess;
-pub mod spline_tess;