title: Changing build variants in bulk in AndroidStudio 3.0+
body: <p>Quick history:</p>
  
  <ul>
  <li>I'm using AndroidStudio 3.0</li>
  <li>my project has 100+ modules (multiple applications and libraries).</li>
  <li>all of them have same flavorDimensions and flavors.</li>
  </ul>
  
  <p>Now question: how to change flavors for all modules in bulk in AndroidStudio 3.0+ without changing each application separately?</p>