feat: attempt to implement math library

Adds many files, but the next thing is to implement the MeshRegistry properly.

src/gpu/vertex3.rs

@@ -0,0 +1,15 @@
+use vulkano::buffer::BufferContents;
+use vulkano::pipeline::graphics::vertex_input::Vertex;
+
+#[derive(Debug, BufferContents, Vertex)]
+#[repr(C)]
+pub struct Vertex3 {
+    #[format(R32G32B32_SFLOAT)]
+    pub(crate) position: [f32; 3],
+}
+
+impl From<&[f32; 3]> for Vertex3 {
+    fn from(v: &[f32; 3]) -> Self {
+        Self { position: v.clone() }
+    }
+}