Implement D-Bus app.GBee.Daemon.RemoveNeighbour method in Neighbourhood::handle_announcement_unregister_noexcept().
Implement property getters callbacks in DBus.
Implement Variant::pack_array().
Use GVariantBuilder placed on stack in Variant templates.
Call g_variant_ref_sink() UniquePtrGVariant arguments initialization list.
Add "neighbours" property to app.GBee.Daemon.Neighbourhood D-Bus interface.
Implement Neighbourhood::get_neighbours_variant().
PropertyGetterCallback in DBus returns now UniquePtrGVariant and daemon is geristered under /app/gbee/daemon instead of /app/GBee/Daemon.
Unown name in DBus destructor.
Update DBus test to check properties getters.