Including scalable icons to improve size coverage

[Matthias Clasen <mclasen redhat com>]

Today I looked at shipping svgs with echo-icon-theme to improve the
coverage and avoid size gaps where we don't have hand-tuned small sizes
yet. 

Unfortunately, doing this blows up the size of the tarball to 70M (after
bzipping !). Looking at some of the large (>500k) icons, I notice a
couple of things:

a) they seem to mostly be created with Illustrator

b) they include a jpeg thumbnail

c) they include a huge binary chunk called  
   <i:pgf id="adobe_illustrator_pgf">


It would be very valuable if someone could work on a little script to 
get rid of the thumbnails and the illustrator-specific stuff. That 
should allow us to shrink the svgs _a lot_ and make it possible to
include them in the package, which is not possible as things stand right
now.


Matthias