Potential improvement: power to VGA pin 9 for SCART blanking

[SanguineBrah]

If you ever make another revision of this board, it might be worth adding a jumper to enable/disable sending 5v to pin 9 of the VGA connector. This would make it possible to use a VGA to SCART cable with a 100ohm resistor to the SCART RGB blanking pin (16) to deliver CGA to a standard European television.

This should be implemented as a jumper because there are reported to be some rare older monitors from when pin 9 was a key pin that mistakenly ground it rather than leaving it N/C.