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All grilo plugins are loaded at startup. However, TrackerWrapper may
not be available yet. In that case, GrlTrackerWrapper is not
created. Once TrackerWrapper becomes available, all grilo plugins are
loaded again in order to instantiate GrlTrackerWrapper.
It means that all plugins are activated two times, while only the
tracker plugin should be loaded.

This issue is solved by only reloading the tracker plugin when
TrackerWrapper becomes available.

All grilo plugins are loaded at startup. However, TrackerWrapper may
not be available yet. In that case, GrlTrackerWrapper is not
created. Once TrackerWrapper becomes available, all grilo plugins are
loaded again in order to instantiate GrlTrackerWrapper.

However, TrackerWrapper may become available while the first tracker
source is added. In that case, GrlTrackerWrapper is instantiated with a first source
but a second source will be created by the second load_all_plugins
call (a new tracker source is created everytime the tracker plugin is
activated). Then, GrlTrackerWrapper won't get any notification because
they will be associated with the second source and not the first one.

This issue is fixed by replacing the GrlTrackerWrapper source
everytime a new tracker source is created.

By returning a non-activatable, non-selectable row in DiscBox avoid the
shadow in the first song of the disc.

A list was used to hold all widgets for selection purposes. This is
unneeded as the ListBox already holds all widget references, also
this would not have worked properly with a changing model.

Use the ListBox widgets directly instead.

Replaces "(Development)" prefix, which gets cut off in GNOME. The icon
is already a development icon as well.

Properly intialize the shared-modules submodule.

It is not enabled currently, so no need to keep this available.

Related: gtk#626

It can be accessed through the Application object.

Reduce init arguments.

The selection button state for SearchHeaderBar while PlaylistsView or
EmptyView is active was not set to inactive.

Closes: #366

The LastfmDialog can be launched if a Last.fm account can be
configured (scrobbler's state is at least NOT_CONFIGURED).
If Goa Last.fm support is disabled, the button stays insensitive.

Related: #218