PORT103R - Initial support for the Waveshare Port 103R development
board.
EUSTM32F103RC - Add inverter.
Replacing the init code for the UG2864 display with code that works on
the cheapest displays currently available from banggood.com.

Cleanup work will happen once the code has been tested on more displays,
such as the ones from Wide.HK and the Crius.

The default has changed to these boards because they are cheap and do
not require modification to get them working, unlike the Crius boards.