cp7 updates and text position #1698
                
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This updates the code for CP7 breaking changes.
I noticed that the "Black Lives Matter" text was shifted a few pixels too high, the top half of "Black" was off the top edge of the matrix display. And the names text was a few pixels off-center to the right. So I fixed both of those things to get "Black Lives Matter" onto the display, and center the names text.
Tested on MatrixPortal 7.0.0 alpha5
I didn't find any guides that go with this project. It's linked from a blog post here: https://blog.adafruit.com/2020/06/08/how-to-make-python-powered-protest-signs-black-lives-matter-say-their-names/