Patch: move XftDraw from frame to device

[Jeff Sparkes]

According to a comment, the XftDraw structure also controls the caching of
Xft fonts.  Moving it from frame to device
makes the cache more effective, and reduces memory use because there's only
a single copy now, instead of one
per frame.

As a next step, I hope to replace the XftDraw with a Pango Xft renderer so
we can pango before the gtk work is finished.

-- 
Jeff Sparkes
jsparkes at gmail.com
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