Better initial placement

[hzeller]

The current initial placement places all components on one spot (WTF). It always requires manual spreading of the component, with complicated decisions if inside/outside board dimensions.

This should be simpler:

• components should always be spread when newly added from the netlist. Don't touch components already there.
• If there are already board dimensions, just place them outside.

Bonus points if components are arranged in a way that they are topologically similar arranged than in the schematic to help guide the user in recognizing the components more quickly.

[hzeller]

(the current OpenGL seems to do a better approach by not placing components on top of each other. A topological thing similar to how they are on the schematic would still be good as it is then faster to relate)