bug#36013: Specify keybindings and font for kmscon-service

[John Soo]

Kmscon supports various font engines (and more than just bitmap fonts!) and 
xorg style keyboard layouts configuration. Those would be really nice to be 
able to configure. I have tried to do this myself.  I found the following when 
modifying the kmscon-service

 - The options can be provided via cli options or configuration file.
 - Keyboard configuration seems to work using cli options for both system and 
non-system profiles. 
 - Fonts cannot be found in the system profile even if the system profile has 
the font installed. When spawned from a non-system profile, kmscon can find the 
fonts so long as the font is installed in the profile and the font cache is 
updated.