Use view.view_proj for world projection

[giraugh]

Hi there! I was checking this out and seeing how it could fit into my project when I found a small issue with the world->screen projection not respecting the camera transform.

I'm not 100% on top of bevy rendering logic but from referencing bevy's sprite shaders seems like using view.view_proj instead of view.projection includes the camera's transform as well the "camera projection".

Summary

• Use view.view_proj instead of view.projection for world_to_screen()

[jgayfer]

Very nice, thank you! Tested it out and you're right, this is how we should be converting to screen space.

I'll cut a release 👍

Edit: v0.1.3 is on Crates.io now