More versions!

TLDR: A lot of minor adds/fixes. New GNOME libraries versions are now available.

New versions of GNOME libraries are now handled §

Thanks to @EPashkin’s work, here are the versions upgrade we were able to perform:

• GTK: 3.16 -> 3.22
• GDK: 3.16 -> 3.22
• GDKPixbuf: 2.32 -> 2.36
• Pango: 1.34 -> 1.42
• GIO: 2.44 -> 2.50
• GLib: 2.40 -> 2.50

Changes §

For the interested ones, here is the list of the (major) changes:

Gtk:

• Add FileChooserButton.
• Provide gtk::MessageDialog manual setter for secondary markup and text.

Gdk:

• Rename struct Attributes to WindowAttr.
• Add getter for ‘button’ property of GdkEventButton.
• Make enum unconvertable to i32 without to_glib and from_glib.

Glib:

• Add signal_stop_emission and signal_stop_emission_by_name.
• Add signal_handler_block and signal_handler_unblock.
• Add KeyFile.
• Move from Gtk signal Inhibit.
• Add utility functions get_application_name, get_program_name, get_environ, …

Gio:

• Change return type for connect_writable_change_event to Inhibit.

Gir:

• Add nullable override for signals -parameters and returns-.
• Add nullable override for constructors.

Cairo:

• Add optional xlib function.
• Add RadialGradient.

Thanks again to both @EPashkin and @gkoz for their amazing work on this update!