* gtk/ActionEntry.cs:
* gtk/ActionGroup.custom:
* gtk/Gtk.metadata:
* gtk/Makefile.am:
* gtk/RadioActionEntry.cs:
* gtk/ToggleActionEntry.cs:
* gtk/UIManager.custom:
* sample/Actions.cs: Updated to use the new *ActionEntry code. Reflects
testactions.c from gtk+ now.
Added C# syntactic sugar for easily defining Action's for the UIManager.
Derived from the same ActionEntry structs in gtk+.
svn path=/trunk/gtk-sharp/; revision=36638