Make theme text colors available through public interface

[shredsonic]

When designing my app, I wanted to have access to some of the specific theme colors. This is handy when trying to customize your app to match the theme the user has chosen. For my use case I just made themeDict public so I can quickly access it and grab the theme colors I wanted. In the example app, you just use the inverse of the background color. While this works most of the time, sometimes it is less than ideal. Most of these themes have text colors that work well on their respective backgrounds, so it would be nice to have access to those through the API.

[raspu]

Hi @zzt4 , yes I like this idea, I would try to make some time to make this and other pending changes this month.

[zachgibson]

@raspu any updates on this? Would you want some help?