{append,remove}Child() were never used, remove them to make it easier to remove the use of "children" array itself later (see #16740). git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78294 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
{append,remove}Child() were never used, remove them to make it easier to remove the use of "children" array itself later (see #16740). git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78294 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775