Move scroll_text into the C++ library and make it support std::string.
Move show_bitmap_1d to set_bitmap_1d in the C++ library. Use it as the basis for show_text and scroll_text.
Change show_text to set_text since it does not implicitly show the result.
Add a new pico-scroll demo to show off the scrolling text functionality.
The ../../../pimoroni-pico path was selecting the "pimoroni-pico" directory adjacent my "micropython" directory
However I was attempting to build against one in a different parent directory.
This resulted in the MicroPython modules including the wrong (old) header and exploding.