title: Convert string to list of bits and viceversa
body: <p>I need to convert an ASCII string into a list of bits and vice versa:</p>
  
  <pre><code>str = "Hi" -&gt; [0,1,0,0,1,0,0,0,0,1,1,0,1,0,0,1]
  
  [0,1,0,0,1,0,0,0,0,1,1,0,1,0,0,1] -&gt; "Hi"
  </code></pre>