Add progress indicator to the HildonEditToolbar.

Add progress indicator to the HildonEditToolbar.

* hildon/Makefile.am
* hildon/hildon-edit-toolbar-private.h
* hildon/hildon-edit-toolbar.c
(+hildon_edit_toolbar_set_progress_indicator)
(hildon_edit_toolbar_init): Add progress indicator to the
toolbar.

* hildon/hildon-gtk.c
(hildon_gtk_window_set_progress_indicator):
If the window contains a HildonEditToolbar, enable the progress
indicator there too.

* hildon/hildon-private.h
* hildon/hildon-private.c
(+hildon_private_create_animation)
* hildon/hildon-banner.c
(-hildon_banner_create_animation):
Moved to hildon-private.c

Fixes: NB#102373 (Progress indicator also for the Edit mode
toolbar)