Headless pictures draw on the GPU, with the viewport's pipelines (CPU rasterizer as last tier) (#1555)

Thanks @jyviko.

crates/render/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "solidcraft-render"
-description = "SolidCraft view math (orbit camera, projection, picking rays) and a CPU rasterizer for headless snapshots"
+description = "SolidCraft view math (orbit camera, projection, picking rays), the description of headless pictures, and product render jobs"
 version.workspace = true
 edition.workspace = true
 license.workspace = true