User-friendly message about missing assets directory

[ozkriff]

See ozkriff/zoc#211

[ozkriff]

Actually, it is checked in Visualizer::new:

zemeroth/hate/src/visualizer.rs

Lines 10 to 24 in eeeea0d

	#[cfg(not(target_os = "android"))]
	fn check_assets_dir() {
	use std::fs;
	use std::process;
	// TODO: check assets version
	if let Err(e) = fs::metadata("assets") {
	println!("Can`t find 'assets' dir: {}", e);
	println!("Note: see 'Assets' section of README.rst");
	process::exit(1);
	}
	}
	#[cfg(target_os = "android")]
	fn check_assets_dir() {}

zemeroth/hate/src/visualizer.rs

Lines 36 to 38 in eeeea0d

	impl Visualizer {
	pub fn new(settings: Settings) -> Self {
	check_assets_dir();

The problem is that

zemeroth/src/main.rs

Line 15 in eeeea0d

let settings = ron::de::from_str(&hate::fs::load_as_string("settings.ron")).unwrap();

is called before Visualizer::new.