python: Replace the image crate with png We weren’t using any of its features anyway, so the png crate is exactly what we need, without the many heavy dependencies of image. https://github.com/image-rs/image-png/pull/670 will eventually make it even faster to build.

from .matrix cimport Matrix

cdef Matrix *ortho_2d(float left, float right, float bottom, float top) nogil
cdef Matrix *perspective(float fovy, float aspect, float zNear, float zFar) nogil
cdef Matrix *setup_camera(float dx, float dy, float dz)