Also allow 100 walls, and removal of all walls upon death

Godot is a pain with source control and sometimes you've just gotta have
a trash commit. This is it.

Also allows subsequent connections, but it's broken. Don't tell the git
gods that this commit is a lie

This reverts commit f41676c672.

I misunderstood the way the camera projections work, and I'm better off
using the original raycasting strategy.

Hero 1 fails, probably 0 too haven't checked though. Hero 2 is fine.
Haven't tested 3.

And Camera.project_ray_normal. This is much better