[General] Favicons: Use Icon Sushi

[Jared Rhine]

The Chandler Project now has better-looking browser "favicon"s (favorite 
icons, which show in the browser location bar and each browser tab.

I'm writing up the details because collectively, we really struggled 
finding tools that worked properly for creating good favicons (see bug 
#9650).

In short, my strong recommendation is to use:

   Icon Sushi : http://www.towofu.net/soft/e-aicon.php

every time you need to generate a ICO-format image, in particular the 
16x16 size used for favicons.

Icon Sushi is a Windows-only application, but ICO format is essentially 
Windows-only, so that sorta makes sense.  It works fine from Parallels 
on a Mac.

Icon Sushi can read in a PNG file, including alpha channel, and 
translate that accurately to a transparent ICO file.  This is apparently 
a rare feature.  (It can also generate Vista-format icons too).

Previous efforts which used other applications or Photoshop's export 
capabilities, did not produce a good-looking ICO.  It worked, but with 
the new Icon Sushi-generated favicon, you can see the tail on the 
Superdoge; you couldn't see that before.

I don't entirely understand the relationship between this favicon and 
the ICO files used in the Chandler Desktop Windows release; the Windows 
ICOs may be fine, though when I copied them into a browser, they didn't 
work very well as ICOs.

-- Jared