[Gtk-sharp-list] API cleanup for Gtk# 3.0

[mkbosmans]

I'm not shure if it's the intention to break api on going to Gtk# 3.0, but
there is certainly a lot of room for improvement. Here are three examples I
ran into the last couple of days.

* AccelGroup.ConnectByPath(string accel_path, IntPtr closure) and other
connect/disconnect methods. I'm not shure how to generate a closure pointer
in C#. The method probably should accept a delegate.

* Widget.Path has the signature void Path (out uint path_length, out string
path, out string path_reversed). At least the length parameter can go and
may be even the reversed path so the normal path string can be the return
value, as to avoid ugly out parameters.

* Gtk.Accel: there are just 2 non-obsolete methods in this class. Can they
also be moved to AccelMap? In general it would be nice to remove some really
obsolete stuff from Gtk#.

If there is consensus on the list that these (and there are probably more
too) things should be fixed, then I shall file bugzilla entries for them and
try to produce some patches.

Maarten Bosmans
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