[cairo] SVG Backend rewrite (drop libxml2)

[Kristian Høgsberg]

Here's a patch to rewrite the SVG backend to not use libxml2 for
output, but just use the cairo output streams.  The patches leading up
to the actual rewrite introduce a cairo_memory_stream_t that just
buffers the data in memory.  The SVG backend already builds up the
entire document as an in-memory document tree, so switching to
in-memory streams isn't a performance regression.

cheers,
Kristian
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