* generator/ClassBase.cs : make MarshalType virtual.
* generator/Parameters.cs : add Parameter class and Indexer.
* generator/Signal.cs : Now use Parameters.
(GetHandlerName): New abstraction of name handling.
(GenerateDecls): use GetHandlerName.
(GenComments): make private.
(GenHandler): New. Generate custom event handlers and args.
(Generate): use GenHandler. Pass args type to SignalHandler.
* generate/SignalHandler.cs : store args type. Generate handler
dependent args and use MulticastDelegate.DynamicInvoke.
* generate/StructGen.cs : override MarshalType.
* glib/SignalCallback.cs : store a MulticastDelegate and args type
* sample/*.cs : use new DeleteEventHandler
svn path=/trunk/gtk-sharp/; revision=5834
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