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When creating a new project and clicking Title > Create-and-insert,
the project emits done-importing which should be signalled only when
importing external files.

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1061824

The logic is missing and we are not sure how useful they are.
The unittests when the functionality has been added are long gone:
efa26eb0

This would be a saner default

Also update the French translation

Fixes bug #721888

Using the pixel aspect ratio to set the viewer's (display) aspect ratio
made no sense. We had a nice unused method for that exact purpose.

This also happens to fix bug #722003

Otherwise aspect ratio changes would not always get applied.

Fixes bug #721973

This way we make sure that the viewer updates

With all the efforts I put into making it work, it breaks my heart to remove it.
However, with the planned use of client-side window decorations with HeaderBar,
it makes no sense to keep it.

First, the HeaderBar saves a ton of space, making fullscreen much less needed:
it takes 48 pixels instead of the previous 101 pixels.

Second, the way the fullscreen feature worked was by ripping out the
main toolbar, adding it on a temporary floating widget, then doing the reverse
operation when exiting fullscreen. This approach won't work with the HeaderBar,
as you cannot unset the client-side titlebar decoration, and the buttons we put
in HeaderBar are not contained in a GtkToolbar widget (themes don't like it).
Manually ripping out each and every widget from the HeaderBar isn't an option.

Removing this also reduces code complexity and problems (such as dealing with
detachable UI components or multiple monitors).