Rename example directory
Remove x86 binary (rebuild locally with gcc -o port_open port_open.c)
Changed sleep value 0.2 to more sensible 2 (float arg not accepted and causes prog to busy wait)
Add a way to get current colour in GFX lib
Add a new \e[x;yX escape to draw a point using current colour

Conflicts:
	show_main/show_main.ino
Debug comments
Provide an SPI write routine that doesn't wait for SPI Data Register to
drain before returning.
Use new routine in places where removing the delay shouldn't cause
problems.