XMEGA add support for RS232 6 and baud 256k

USARTF0 as RS232 6.
Baud 256000 with system clock at 32MHz.

Signed-off-by: Tim Rule <trule.github@nym.hush.com>
AL-XSLED-EXT Display App for uOLED 96 G2 SGC

Display APP and Driver for uOLED 96 G2 SGC.

Signed-off-by: Tim Rule <trule.github@nym.hush.com>