add samples for various export syntax

test/runtime/samples/prop-exports/_config.js

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+import { writable } from '../../../../store';
+
+export default {
+	props: {
+    s1: writable(42),
+    s2: writable(43),
+    p1: 2,
+    p3: 3,
+    a1: writable(1),
+    a2: 4,
+    a6: writable(29),
+    for: 'loop',
+    continue: '...',
+	},
+
+	html: `
+    $s1=42
+    $s2=43
+    p1=2
+    p3=3
+    $v1=1
+    v2=4
+    vi1=4
+    $vs1=1
+    vl1=test
+    $s3=29
+    loop...
+  `
+}

test/runtime/samples/prop-exports/main.svelte

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+<script>
+  // export multiple subscribables in one line
+  export let u1, s1, u2, s2
+
+  let p1, p2, p3
+
+  // export previously declared props
+  export { p1, p3 }
+
+  // aliased props <component a1={...} a2={...}> assign to v1, v2
+  let v1, v2
+  export { v1 as a1, v2 as a2 }
+
+  // aliased export with initializer
+  let vi1 = v2
+  export { vi1 as a3 }
+
+  // aliased subscribable export
+  let vs1 = v1
+  export { vs1 as a4 }
+
+  // aliased with literal initializer
+  let vl1 = 'test'
+  export { vl1 as a5 }
+
+  // aliased store surrounded by non-aliased non-stores
+  let n1, n2, s3
+  export { n1, s3 as a6, n2 }
+
+  // keyword exports
+  let k1, k2
+  export { k1 as for, k2 as continue }
+
+</script>
+
+$s1={$s1}
+$s2={$s2}
+p1={p1}
+p3={p3}
+$v1={$v1}
+v2={v2}
+vi1={vi1}
+$vs1={$vs1}
+vl1={vl1}
+$s3={$s3}
+{k1}{k2}