title: Xamarin.Forms: Remove padding inside Button
body: <p>I want to have a small button. The height of the button is 30. On some plattforms (Android, UWP) the text inside the button is cut off. That's because there is a padding between the text and the outside border.</p>
  
  <p>One option is to make the button bigger, but there is enough space for the text. Is there an option for setting the inside padding?</p>