title: TextColor vs TextColorPrimary vs TextColorSecondary
body: <p>What do each of these encompass in terms of text throughout an app?</p>
  
  <p>More specifically, what would changing each of these in a theme change throughout my app? I'd like my buttons' texts to be a different color than my textviews; is one primary and the other secondary? </p>
  
  <p>Any info related to these terms is appreciated!</p>