Switch to good-web-game completely

[ozkriff]

Though historically good-web-game was created for the web, now it's powered by rapidly improving miniquad and works fine on linux/macos/win/wasm and Android.

Also, I would be so happy do get rid of this ugly crate swapping hack))

zemeroth/src/main.rs

Lines 3 to 6 in b74f952

	#[cfg(not(target_arch = "wasm32"))]
	extern crate ggez;
	#[cfg(target_arch = "wasm32")]
	extern crate good_web_game as ggez;

good-web-game is a kinda a half-measure: I'm planning to eventually migrate to miniquad completely.

[ozkriff]

Also, this should allow me to get rid of the massive nalgebra dependency.

[ozkriff]

ggez/good-web-game#36 ("Add Conf::physical_root_dir")