[gtkmm] gtkmm 2.3 TODO

[Murray Cumming Comneon com]

I have made improvements to UIManager/Actions and the ComboBox, and I'll
check that in a couple of days.

I have not wrapped any of the new File* stuff, so I'd like somebody to make
a start on that.
There's also the gtkmm 2.4 bug list here
http://www.gtkmm.org/bugs.shtml
and some //TODO comments in the code.

Murray Cumming
www.murrayc.com
murrayc usa net