Use model buttons instead of grid with labels and radio buttons, also
shrink paddings to match other apps.

Flatpak builds doesn't have network access. We run the ninja tests there.
The network is only used to fetch the screenshots and validate them.
Make sure they are always valid by running the tests locally before updating the screenshots.

Validate desktop file using desktop-file-validate
Validate appdata file using appstream-util

Remove all the code for a custom user-defined label (using an entry).
This code path has been dead for a while, and it's better to use the
built-in entry of a ComboBox anyway. This way, we can alo reintroduce it
later.

We can now also derive directly from a Gtk.ComboBox, which simplifies
the code even further.

Finally, this commit adds some documentation in the TypeCmbo, which
hopefully makes it easier to understand for new contributors.

In some cases, a null-TypeDescriptor could be returned, spawning a
g_critical() in the ContactSheet. Also, the VcardTypMapping.matches
function didn't always correctly return the right value.

We completely decouple TypeSet and TypeDescriptor and expose the former
as a public class, so we can use it from outside. This means we don't
necessarily need to fiddle with TreeIters if we know what we need from
the TypeDescriptor. We also slit up VCardTypeMapping in a separate file,
and put all the logic whether something matches or not as methods of
that struct.

This commit cleans up a lot of the mess in TypeSet. I'm afraid that
means it's quite a large diff, but from now on, the code should be more
decoupled than before, making changes at the very least bearable.

There's also some more debug statements, which should help in case
something goes wrong when running at one of our users.

This isn't supported (at the moment) anyway and only complicates things,
so let's get rid of it to simplify the code base a bit (we can always
reintroduce it later in a cleaner form).

This removes the generic and unclear name `InitData` in favor of
`VcardTypeMapping`, which is intuitively much more clear on what it
actually is used for.

Instead of building a hash table and adding each type as a key, we just
use a normal list. This won't add too much overhead and makes the data
structure much less redundant (and easier to work with) and obscure.

Due to a race condition, a persona store could be available _before_ the
signal was handled. That meant that sometimes this signal wasn't
triggered when it really should've been. The easy fix (and imho) cleaner
solution is to not provide any E-D-S specific behaviour, and to just
listen to newly available backends in general.

Fixes https://gitlab.gnome.org/GNOME/gnome-contacts/issues/114.

- template proportions update

(cherry picked from commit 1270835e)

This fixes a bug where, if a contact is updated, instead of the current
fields being replaced, they got added again.

This allows us to get rid of a lot of unnecessary signals and scheduled
handlers filling up the main loop for honestly no good reason.

There was some trouble getting it set up so it regularly failed,
without anyone taking a look at it. Let's save some bucks by skipping
those.

So we at least now how many contacts were added/removed.

That should help us out when debugging issues

This is needed to add good looking sliding animations to the tilte bar.

This also:
- Adds the sidebar style class to the header separator, which is needed
  for it to remain styled correctly.
- Sets the selection mode on the title bar rather than its elements.
- Drops the now useless selection mode separator custom style.

This is needed as we will use it in the next commit in a GtkBuilder
descriptor.

(cherry picked from commit 3ff93b18)

We can do better using the `notify` signal on the individual itself.

Disable building the inspect and import tool, since GNOME Contacts
doesn't use them anyway. They were failing because the curses library
couldn't be found.

This was broken after splitting of a separate library for testing
purposes.

Fixes #108.

We actually already assumed this when building docs.

This avoids to handle the window decoration layout of each heaader bar
by hand and simplifies the code.

This is needed as we will use it in the next commit in a GtkBuilder
descriptor.