[Merge] lp:~ken-vandine/content-hub/pasteboard into lp:content-hub

[Daniel d'Andrada]

Would be good also to move over the test for the serialization and deserialization code from lp:qtmir in tests/mirserver/Clipboard/clipboard_test.cpp.

Namely TEST(ClipboardTest, MimeDataSerialization)
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https://code.launchpad.net/~ken-vandine/content-hub/pasteboard/+merge/296352
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