Set the global chat status more intelligently

Up until now, the global chat status was set every time an application called
_set_status.  Thus, global status really meant "status of the app that last
changed the status".

Now, the service remembers the chat status for each application and sets the
global status as a combination of all of application statuses.  If applications
have different statuses, the menu items are shown in an inconsistent state.
This is implemented in IdoMenuItem by making it accept state as an array of
strings in addition to a single string.  It is drawn inconsistent if the state
contains the menu item's target value in addition to other values.

When the global status is changed through the messaging menu, the service
doesn't update the action immediately anymore.  Instead, it notifies all
applications about the change via the "status-changed" signal.  Applications
must call _set_state to acknowledge that they have indeed changed their state.
This is consistent with libmessaging-menu's documentation and design.

Also, the SetStatus D-Bus call was missing a "desktop-id" parameter to tell the
menu which application changed status.  Changing this doesn't break existing
apps, as the D-Bus interface is considered private to indicator-messages.

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