support optional text_background_color for cards #30
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I noticed that one of the cards in the
cyoa/
example has a grid of grey pixels for it's background image with black text on top of it.The grid makes the text pixelated and a little difficult to read.
I've added a new
text_background_color
property that can be specified int he card configuration JSON to set a desired background color on the labeled, and modified that one page to use this new feature to put a more contrasting color behind the text.Here is the slide with the current library (including the background img fix from #29):

Here is the slide with the changes from this PR:
