Allow newline for labelSepChar in Pie3D

[Astro]

Instead of seeing pie chart slice labels like :

300Mb, 22%

we'd like to see :

300Mb,

22%

[Pallav]

Hi,

As of now, we do not support breaks in Pie 3D chart labels (owing to smart label calculations).

[MrFast]

I agree. Better control (new lines, esp) of the labels would be a great improvement. 

Today, the labels seems to force the pie chart to get resized automatically, This doesn't look nice, ie. when a long label hits the outer border of the chart, the pie area is drawn smaller. Making the image "jump" whith each refresh. Having new lines in labels would cut this behaviour down to a minimum.

Thanks!

/Hans