Refactored code to make it easier to define a font family for the application along with its own specific ‘textStyle’ values.
For example, you can have the Roboto font family with ‘normal’, ‘bold’, ‘condensed’, ‘condensedBold’ etc. and also the SourceSansPro family with ‘lightItalic’ and ‘black’.
Normally in one application theme you have a single font family, but this also supports multiple font families at once.