#5 Graphics objects 1

[Diemo Schwarz]

First the simple stuff:

Graphics objects (vector display, matrix display,
oscilloscope, but also slider, etc.) should make their
inspector configuration fields available as messages.

E.g. setting the min/max range would become equivalent
to sending a 'set min -5.0' or 'miny -0.5' message.

Also the coulour should be settable by 'foreground rgb
0 0.5 1' or 'background hsv 0 0 0' or 'set foreground
black'.