title: MSBuild ItemGroup with condition
body: <p>I don't know if <code>ItemGroup</code> is the right type to use. I will get 4 different booleans that will be true or false depending on choice.</p>
  
  <p>I would like to fill up an <code>ItemGroup</code> with this "strings" depending on the true or false. Is that possible or what should I use?</p>
  
  <p>Example</p>
  
  <pre><code>Anders = true
  Peter = false
  Michael = false
  Gustaf = true
  </code></pre>
  
  <p>My <code>ItemGroup</code> should then have
  Anders and Gustaf.</p>
  
  <p>Is that possible or how should I solve that?</p>