Use embedded icon - Part 3

[refaelsh]

I am opening this PR in continuation of this: https://github.com/cdepillabout/termonad/pull/228.

Closes https://github.com/cdepillabout/termonad/issues/165

[cdepillabout]

@refaelsh I pushed two changes:

• I was having trouble finding a build plan for all the new transitive dependencies (like repa), so I started wondering if there was a way to just use GdkPixbuf for loading arbitrary image files. It turns out that there is a function https://hackage.haskell.org/package/gi-gdkpixbuf-2.0.31/docs/GI-GdkPixbuf-Objects-Pixbuf.html#v:pixbufNewFromStream that uses the gdkpixbuf library's internal logic for loading arbitrary image files.
• I moved the new function to Termonad.GTK, since it is pretty general now.

[cdepillabout]

Thanks for working on this!

[refaelsh]

Thanks for working on this!

You are welcome :-) I enjoyed it :-)