Make an app icon

[cannam]

Piano Precision needs an icon! At the moment it is just using the SV one.

A way to approach it might be to edit the Sonic Visualiser icon SVG outline using Inkscape or similar, perhaps producing something with the same general design, i.e. a coloured box with some topical outline inside.

(Conversion from SVG to whatever other formats we might need is something I can handle easily enough.)

For reference, the icons for SV and its related applications Tony and Sonic Lineup are:

[yucongj]

How about this design:

[yucongj]

Here's the SVG version of the icon: