@param font A font resource id like R.font.somefont as introduced with the new font api in Android 8

@return an mutable instance of the build

loads style attributes from styles.xml if a style resource is used.

This call will make the StyleableToast's background completely solid without any opacity.

@param cornerRadius Sets the corner radius of the StyleableToast's shape.

Sets where the StyleableToast will appear on the screen

@param length {@link Toast#LENGTH_SHORT} or {@link Toast#LENGTH_LONG}