refactor: Change syntax to support closers capturing variables

[mhevery]

Change syntax from:

const Counter = qComponent<{}, {count: number}>({
  onMount: qHook(() => {count: 0}),
  onRender: qHook((props, state) => (
    <button on:click={qHook<typeof Counter>((props, state) => state.count++)}>
      {state.count}
    </button>
  )
});

to:

const Counter = qComponent<>(() => {
  const state = useState();
  return onRender(() => (
    <button on:click={() => state.count++)}>
      {state.count}
    </button>
  )
});