Revert "adding 3d sprites"

This reverts commit 8c84c08f7e.

src/canvas/managed/mod.rs

@@ -3,7 +3,6 @@ pub mod shader;
 pub mod handles;
 pub mod canvas_text;
 pub mod gpu_buffers;
-pub mod teapot_data;
 
 use vulkano::pipeline::shader::{SpecializationConstants, SpecializationMapEntry};