icon theme changes

[Brian J. Tarricone]

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Hi all,

Earlier this evening I replaced the XfceIconTheme stuff in the
xfce_themed_icon_*() convenience functions with GtkIconTheme calls plus
a little crap to make GtkIconTheme a little less picky about icon names.

I plan to turn XfceIconTheme into a simple proxy object for GtkIconTheme
and leave it in place solely for backward compatibility.  All Xfce apps
should eventually be changed to either use GtkIconTheme directly, or the
xfce_themed_icon_*() convenience functions, and XfceIconTheme should not
be used *at all*.  I'll be reimplementing the category lookup
functionality as convenience functions along side the other
xfce_themed_icon_*() stuff.  If you don't get around to fixing this for
your particular app, no worries: XfceIconTheme will still work in 4.4.

Anyway, it's somewhat likely that some icons in some apps that were
found before might stop being found.  If so, please file a bug (feel
free to assign it to me) and let me know specifically which icon in
which application.  The more specific the better.  The desktop menu
seems ok so far, so I'm not overly worried.

I know it may not be the best idea to be making a change like this right
now, but I think it's worth it, and the risk is relatively low.

	-brian

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