examples: Add a HdyPreferencesWindow example

7 jobs for preferences in 10 minutes and 25 seconds (queued for 3 seconds)
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  Build
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build-debian-clang

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build-debian-gcc

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build-debian-gcc-static

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build-fedora-gcc

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  Docs
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build-gtkdoc

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  Test
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unit-test

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package-debian

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