Fix CVE-2021-39358 by forcing TLS certificate validation

Closes #17

See merge request !5

This is similar to the fix performed in other packages. See
Teams/Releng/security#57 for more
details.

Tested on Linux From Scratch 11.0 and on Debian 11.

Fixes #17

Replace all the deprecated APIs with GTask for those async jobs.

me is such a convenience way to get users' information.
However, replace all the deprecated APIs with GTask for the job.

- change indent to 2 spaces
- refactor

We change the API version for experiments.

The private elements set by g_strdup() must be freed
when the instances of the class finalize.

#3

GMutex should be cleared when it is no longer needed.

Private property must be freed after it is done.

#3

Fix memoy leaks and use g_auto* convenient macros instead of
manually freeing resources.

#4

user: Fix memory leak

See merge request !4

RestProxyCall instance and private properties must be freed after it is done.

https://developer.gnome.org/rest/unstable/RestProxy.html#rest-proxy-new-call

#3

g_print should be against to print debugging messages from within libraries
as its comment says.

https://developer.gnome.org/glib/stable/glib-Warnings-and-Assertions.html#g-print

Creating a new album by edges is deprecated[1]. We can revert
this commit later if we want to enable it again.

[1]: https://developers.facebook.com/docs/graph-api/reference/v3.3/album#publish

The macro will do nothing if a compiler doesn't support the GNU
compiler extension instead of raising an error.

!1

The presence of a priv pointer prevents the use of
G_DECLARE_DERIVABLE_TYPE.

!1

The presence of a priv pointer prevents the use of
G_DECLARE_DERIVABLE_TYPE.

!1

The presence of a priv pointer prevents the use of
G_DECLARE_DERIVABLE_TYPE.

!1

The presence of a priv pointer prevents the use of
G_DECLARE_DERIVABLE_TYPE.

!1

Updated endpoint URL to the new Graph version.

It was required to use the "fields" param (see
https://developers.facebook.com/docs/graph-api/using-graph-api#reading)
to retrieve the email of an user and added the permission "email" too.

https://bugzilla.gnome.org/show_bug.cgi?id=772243

https://bugzilla.gnome.org/show_bug.cgi?id=760108

Added required permissions for publication