[Merge] lp:~fboucault/camera-app/state_save_viewfinder into lp:camera-app

[Florian Boucault]

> State saving of enum fails, fix is about to be ready. I will link here since
> this MR will depend on it.

https://code.launchpad.net/~fboucault/ubuntu-ui-toolkit/state_saving_store_type/+merge/228503
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https://code.launchpad.net/~fboucault/camera-app/state_save_viewfinder/+merge/228482
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