In the vast majority of cases, columns are just appended to the end and not
inserted at arbitrary positions in wxListCtrl so provide a convenient wrapper
to do this, especially as it's really trivial to do it now when it can be done
only once at wxListCtrlBase level.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70283 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Use the column labels to determine the minimal width required by the control
to show them all in full.
Also declare all image list and column-related wxListCtrl methods in
wxListCtrlBase now as we need some of them in DoGetBestClientSize()
implementation.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70282 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
