You touching a wall does not do it. This encourages teamwork / using
your walls in clever ways to gain charge.

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

I love git bisect! The problem was due to me accidentally deleting a
crucial condition `is_network_master` when checking for hero_switch
input.

This reverts commit f41676c672.

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