Add support for TB_GETMETRICS and TB_SETMETRICS messages

[Robert Shearman]

Dmitry Timoshkov wrote:
> > > What another field should be used for c[x|y]ButtonSpacing instead?
> >
> > It looks like it. It shouldn't be too hard to add support for
> it. You will
> > just need to change TOOLBAR_CalcToolbar to add on the extra
> spacing between
> > the buttons.
>
> I take it that toolbar.c code doesn't have support for button spacing yet?
> In that case I'll wait for your work. Feel free to add support for it in
> your patch and incorporate my work in it.

Ok. Will do. I have another patch in the works adding the other missing
messages too.

Rob