For roguelike games, most output will directly result from and follow
immediately after input from the user. In other situations, data
should not be expected.
The RLG-Web server can now be controlled with commands sent to stdin.
Currently, the only one implemented is "quit". Some improvements to
the shutdown process were also made.
Port the JSON communication from WebTTY to RLGWeb. Fixing out-of-order
messages is still not implemented on the server side. Terminal size is
still hard-coded. Unused code is still lying around.
