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Libraries shouldn't really use `g_message()` as it will show up in
consumer application outputs. Let's use `g_info()` instead.

Fixes #40

GSimpleAsyncResult is deprecated in favor of the simpler GTask, so use
that instead. This cuts down on the deprecation warnings.

I wanted to do both separately, but porting one without the other led to
some faulty casts from GSimpleAsyncResult to GTask (and vice versa).

As g_variant_builder_add_value() takes ownership of a floating
GVariant, we don't need to unref it afterwards.

See https://developer.gnome.org/hig/stable/typography.html

https://bugzilla.gnome.org/show_bug.cgi?id=772528

 * This is necessary because sometimes we don't want to complain,
   for expected errors, when running nested operations.
 * The fact that we have to do this is silly, and soon there
   will be a solution in glib itself.

https://bugzilla.gnome.org/show_bug.cgi?id=688165

 * Death by a thousand paper cuts from gir and vapi not liking
   the fact that the secret.h file was not usable uninstalled
   and installed in the same way.

 * and strip remote error codes from error->message so that
   they don't clutter things.

 * Update to LGPL 2.1
 * Fix typos in license comments
 * Update FSF address

https://bugzilla.gnome.org/show_bug.cgi?id=673194

 * This prevents blocking on entropy

 * Fixes the namespacing capitalization issues run into with
   gobject-introspection and glib code tools

 * Fix bugs and tests

 * And fix bugs found in the process