[PATCH] Encode origin of request in FuncRequest

[Jean-Marc Lasgouttes]

This patch is a first step in solving bug 1720 (LyX/Mac: Menus are not
correctly disabled when a dialog has focus), for which I would need in
getStatus to be able to determine that a FuncRequest has been
generated by the menus.

Here, I add a new 'origin' enum to FuncRequest, defined as follow:

        /// Where the request came from
        enum Origin {
                INTERNAL, 
                UI, // The menu or the toolbar
                KEYBOARD, // a keyboard binding
                COMMANDBUFFER 
        };

Other values can be added, like lyxserver or MENU/TOOLBAR to split UI
in two. 

As an application of this value, the patch removes the 'verbose'
argument of LyXFunc::dispatch. Functionnality is unchanged.

Comments? I am not sure I like the way origin is manipulated, but
since FuncRequest does not have accessors, I decided (for now) not to
add one (which would have given better code, I think).

JMarc

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