add uw8-window crate

uw8-window/src/lib.rs

@@ -0,0 +1,19 @@
+use std::time::Instant;
+
+mod cpu;
+mod gpu;
+
+pub fn run<F: 'static + FnMut(&mut dyn Framebuffer, u32, bool) -> Instant>(update: F) -> ! {
+    match gpu::Window::new() {
+        Ok(window) => window.run(Box::new(update)),
+        Err(err) => eprintln!(
+            "Failed to create gpu window: {}\nFalling back to cpu window",
+            err
+        ),
+    }
+    cpu::run(Box::new(update));
+}
+
+pub trait Framebuffer {
+    fn update(&mut self, pixels: &[u8], palette: &[u8]);
+}