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Match GLib's log message handling

See merge request !5

After GLib gained support for structured log messages, it started
handling info-level messages differently, by showing them only if the
G_MESSAGES_DEBUG environment variable is set to either "all" or to a
colon-separated list of log domains that include the log domain used by
the message.

The Perl bindings override the old, unstructured log message function,
which disables all the logging capabilities inside GLib. Since the Perl
bindings currently do not support G_LOG_MESSSAGE_INFO and
G_LOG_MESSAGE_DEBUG messages, this means that Perl applications and
modules will always print out debugging messages that would normally not
be visible; additionally, the info-level messages use a generic "LOG"
marker which makes them look like actual warnings, instead of the debugging
messages they are.

In order to fix this, and be backward compatible with older versions of
GLib, we need to reimplement the logging logic from GLib into our own
bindings. This also means adding the ability to emit info-level log
messages.

Silence most compiler warnings

See merge request !7

Rename DOAP file in the manifest

See merge request !6

We know it's deprecated, but we can keep using it.

Make sure to ignore the deprecation warnings as well.

Hide them behind a version check, and make sure to ignore the
deprecation warnings.

We're using the old vector-based API, which has been deprecated.

Since we know that, let's disable the deprecation warnings, to avoid the
compiler getting angry at us.

In case we're building against GLib < 2.26, we need to provide fallback
macros to mark sections with deprecated API use.

Since versions of GLib prior to 2.26 didn't mark deprecated types,
functions, values, or macros, we can get away with no-ops.

The ownership of the string returned by the C function is not
transferred.

The DOAP file must match the name of the repository, and since
perl-Glib.doap was renamed to perl-glib.doap, we need to update the
MANIFEST, otherwise we're going to get warnings when building the
project.

POD: add short description for Glib::VariantDict.

See merge request !3

Do not try to use/test g_variant_lookup_value if glib is not new enough.

https://rt.cpan.org/Ticket/Display.html?id=127831

- GNOME Git repos are now hosted in a GitLab instance, updated URIs

https://bugzilla.gnome.org/show_bug.cgi?id=784155

- (RT#122140) Allow overriding of current time in order to make it easy
  to build distribution packages of software like Goo::Canvas in a
  reproducible way; see https://reproducible-builds.org/ for why this
  matters, and
  https://reproducible-builds.org/specs/source-date-epoch/ for the
  definition of this variable.  Many thanks to Bernhard Wiedemann for
  the patch.

Perl 5.26.0 will no longer include '.' in @INC by default, so adjust all
'require' statements that made this assumption.

There was already a watchdog timeout callback installed, but it simply
raised an exception which was then ignored.  Instead, signal test
failures and quit the active main loop.

https://bugzilla.gnome.org/show_bug.cgi?id=772328

https://bugzilla.gnome.org/show_bug.cgi?id=772329