gtk 3.14: use GtkBox instead of GtkVBox
gtk 3.14: schema has been deprecated use schema-id

https://developer.gnome.org/gio/stable/GSettings.html#GSettings--schema
gtk 3.14: ImageMenuItem has been deprecated in 3.10

https://developer.gnome.org/gtk3/unstable/GtkImageMenuItem.html#gtk-image-menu-item-set-image
gtk 3.14: GtkResizeMode GTK_RESIZE_QUEUE has been deprecated

https://developer.gnome.org/gtk3/unstable/GtkContainer.html#GtkResizeMode
gtk 3.14: remove deprecation from about dialog

* add default response
* set_transient_for in about dialog

    https://developer.gnome.org/gtk3/unstable/GtkWindow.html#gtk-window-set-transient-for

* don't use stock buttons
* remove unneeded close callback
gtk 3.14: fix gdk_window_set_icon_list warning

Fix following warning:
(pitivi:18711): Gdk-WARNING **: gdk_window_set_icon_list: icon too large (512x512)

don't set icon on main window and about dialog, since it prints a size warning
gtk 3.14: more dialogs

* set transient
* don't use stock buttons
gtk 3.14: more padding and margin
gtk 3.14: update icons to new names

ui: use correct gtk menu icon
gtk 3.14: remove deprecation from filelisterrordialog
move icons to top of file for glade. add icon to Document open

move icon declarations to the top
Remove H and V from GtkScale, GtkPaned and GtkButtonBox
gtk 3.14: overwrite all files with glade. Verify 3.12. Replace GtkTable with GtkGrid