I've added a runner override to use the wasm-server-runner for easy
devlopment -- it's a localhost webserver to provide the WASM binary &
it's bootstrap code.
There is also target-specific config related to the RNG back-end.
And that's the program, all finished and working as intended.
Step 1: boiler plate.
Step 2: Everything else.
The program isn't that complicated, so I didn't really feel the need to
spread it out over several commits.
I don't need the game loop running at full speed all the time. I'm going
to see about putting Bevy into "low power mode" while still drawing at
regular intervals.
