Remove `graphics` (almost)
This merge request (almost) removes the graphics/
directory. The file pixel.h
still has be to kept around a bit longer as it is used by dev/ppm/ppm.cc
.
A decent number of commands were removed from ui/commands.cc
and some of the user interface bits have been removed as well, for example ui/uginterface.{cc,h}
and ui/cmdint.{cc,h}
.