message: Implemented font props of BarButton
  Also uppercased text only button to match android
diff: @@ -3,7 +3,7 @@ import { Image, Text, TouchableOpacity } from 'react-native';
  import NavigationBarContext from './NavigationBarContext';
  import ActionBar from './ActionBar';
  -const BarButton = ({title, image, search, href, testID, onPress, children}) => {
  +const BarButton = ({title, image, search, fontFamily, fontWeight, fontStyle, fontSize = 14, href, testID, onPress, children}) => {
  const tintColor = useContext(NavigationBarContext);
  const childrenArray = (React.Children.toArray(children) as ReactElement<any>[]);
  if (search) return null;
  @@ -12,7 +12,7 @@ const BarButton = ({title, image, search, href, testID, onPress, children}) => {
  <TouchableOpacity href={href} testID={testID} onPress={onPress} style={{marginStart: 24}}>
  {image
  ? <Image source={image} style={{width: 24, height: 24, tintColor}} accessibilityLabel={title} />
  - : <Text style={{color: tintColor}}>{title}</Text>}
  + : <Text style={{color: tintColor, fontFamily, fontWeight, fontStyle, fontSize, textTransform: 'uppercase'}}>{title}</Text>}
  </TouchableOpacity>
  ) : children;
  }
  