from static method
Derive theme from a color value and a https://fonts.google.com/ font
Implementation
static ThemeData from(dynamic colorScheme, {String? googleFont}) {
Color color = toColor(colorScheme) ??
toColor(FmlEngine.defaultColor) ??
Colors.blueGrey;
return ThemeData(
colorSchemeSeed: color,
brightness: _brightness,
fontFamily: googleFont ?? FmlEngine.defaultFont,
useMaterial3: true);
}