Modernize App Icon

[athyfr]

Right now the small details are hard to make out on the icon, due to the small size icons are generally viewed in.

I think perhaps GPUpad could use a more simplistic icon, for better recognisability, and consistency.

Here's a few quick examples I made in Inkscape, you can do what you want with them:

Full-color:

Symbolic:

Silhouette:

[athyfr]

Here's a tweaked version of the full-color icon, optimized to be smaller than 500 B: