* libnautilus-extensions/nautilus-font-factory.c:
(nautilus_get_current_font_factory), (nautilus_font_factory_get),
(nautilus_font_factory_new), (nautilus_font_factory_initialize),
(nautilus_font_factory_initialize_class), (font_hash_node_alloc),
(font_hash_node_free), (font_hash_node_lookup),
(font_hash_node_lookup_with_insertion),
(nautilus_font_factory_get_font_by_family),
(nautilus_font_factory_get_font_from_preferences),
(nautilus_font_factory_get_fallback_font), (make_font_name_string):
* libnautilus-extensions/nautilus-font-factory.h:
New class to obtain fonts either by family or from preferences.  A
specific size can be requested.

Right now its a pretty dumb class, but it can be enhanced to do
smart things like looking at gtkstyles and/or smarted choosing of
fonts if the specifically requested size is not avialable.

* components/hardware/nautilus-hardware-view.c: (setup_form_title):
* components/music/nautilus-music-view.c:
(nautilus_music_view_initialize):
* components/rpmview/nautilus-rpm-view.c:
(nautilus_rpm_view_initialize):
* components/services/startup/nautilus-view/nautilus-service-startup-view.c:
(setup_form_title):
* libnautilus-extensions/Makefile.am:
* libnautilus-extensions/nautilus-icon-container.c:
(nautilus_icon_container_initialize):
* src/nautilus-property-browser.c:
(nautilus_property_browser_initialize):
* src/nautilus-sidebar-title.c: (nautilus_index_title_update_info):
Unhardcode xlfd font strings in all of these and use the font
factory instead.