improve "Trace Pixel Art" dialog icon

[Vinipsmaker]

File share/icons/icons.svg contains an icon (id=pixelart-trace) that tries to express the idea of create beautiful curves from carefully crafted pixels with similar colors, while ignores very different colors (the highly colored background).

There are two issues:

 1. The idea isn't well expressed
 2. The icon don't follows Tango theme guideline, creating a visual inconsistency

The first issue can be ignored. The only required thing is to create some icon that the user can remember and relate to the function (open the "Trace Pixel Art" dialog).

The second issue is more problematic, but solution just need to bring back the visual consistency. There is no need to follow the whole Tango icon theme guideline.

I'll follow this issue, but I cannot solve it (my designing skills are negative).

[Nathan Lee (nathan.lee)]

Closing as won't fix as the pixel art dialog has been merged with the Trace Bitmap dialog in 1.0 (and 1.1-dev).

Thanks for reporting this, please feel free to file new bugs about the issues you're seeing at
http://inkscape.org/report.