Please backport gtk2-engines-xfce 3.0.0-1 (universe) from quantal

Please backport gtk2-engines-xfce 3.0.0-1 (universe) from quantal to precise.

Reason for the backport:
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Adds support for GTK3, as well as many minor additions, bugfixes, and translations.

Testing:
========
Mark off items in the checklist [X] as you test them, but please leave the checklist so that backporters can quickly evaluate the state of testing.

You can test-build the backport in your PPA with backportpackage:
$ backportpackage -u ppa:<lp username>/<ppa name> -s quantal -d precise gtk2-engines-xfce

* precise:
[X] Package builds without modification
[ ] gtk3-engines-xfce installs cleanly and runs
[ ] gtk2-engines-xfce installs cleanly and runs

Reverse dependencies:
=====================
The following reverse-dependencies need to be tested against the new version of gtk2-engines-xfce. For reverse-build-dependencies (-Indep), please test that the package still builds against the new gtk2-engines-xfce. For reverse-dependencies, please test that the version of the package currently in the release still works with the new gtk2-engines-xfce installed. Reverse- Recommends, Suggests, and Enhances don't need to be tested, and are listed for completeness-sake.

gtk3-engines-xfce
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gtk2-engines-xfce
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* xfce4
  [ ] precise (Reverse-Depends)
Is a virtual package