[ros-general] Freeldr UI modifications

[mf]

Hi,

I recall having heard several suggestions to make freeldr easier on the 
eyes (don't underestimate 60Hz VGA resolutions on a CRT) and/or make it 
look more familiar to ntldr. I have experimented with editing bootsup.c 
and the result implements both suggestions. The black background makes 
it less flickery on CRT displays and looks more in line with ntldr (the 
Windows boot loader). Please see the attached image and tell me your 
thoughts and observations.

Best Regards,

mf.