move examples into subfolder, added wasm4 skip_ahead

examples/microw8/tunnel.cwa

@@ -0,0 +1,14 @@
+import "env.memory" memory(4);
+import "env.atan2" fn atan2(f32, f32) -> f32;
+
+export fn tic(time: i32) {
+    let i: i32;
+    loop screen {
+        let defer t = time as f32 / 10 as f32;
+        let defer x = (i % 320) as f32 - 160.1;
+        let defer y = (i / 320 - 128) as f32;
+
+        i?120 = ((20000 as f32 / sqrt(x * x + y * y) + t) as i32 ^ (atan2(x, y) * 512 as f32 / 3.141 + t) as i32);
+        branch_if (i := i + 1) < 320*256: screen
+    }
+}