Adding original Stellariscope design. This is the one the prototypes were built from.
This update fixes the issues with the board counting logic in the first edition.
It also adds a driver to the XLAT line in order to prevent fanout problems in large array.
This version has not been built and is unlikely to be built.
-- Rotated Launchpad footprint to align with LED array
-- Swapped vertical connectors to improve routing post-rotation
-- Switched power on TLC5947 to 3V3, in order to accomodate logic levels
-- Relocated power and horizontal connectors to midline (more or less)
-- Added mounting holes
-- Added initial test code