[swfmill] SVG support committed

[Mark Winterhalder]

Quick bug report before I'll go drinking:

It appears that there is an extra anonymous DisplayObjectContainer in
between containers. So, if you have Foo.Bar.Baz, what you get is
Foo.anonymous.Bar.anonymous.Baz. That's not a new problem, it already
existed in the old Swfmill SVG import. Could be my testfile, though --
it's the same I tested the original import with.

Mark