move examples into subfolder, added wasm4 skip_ahead

examples/microw8/warptunnel.cwa

@@ -0,0 +1,15 @@
+import "env.memory" memory(2);
+
+export fn tic(time: i32) {
+    let i: i32;
+    loop pixels {
+        let defer x = (i % 320) as f32 - 160.1;
+        let defer y = (i / 320 - 128) as f32;
+        let defer dist = 10000.0 / (x*x + y*y);
+        let defer t = time as f32 / 20 as f32;
+
+        i?120 = (x * dist + t) as i32 ^ (y * dist + t) as i32;
+
+        branch_if (i := i + 1) < 320*256: pixels
+    }
+}