more grid folding: got rid of duplicate version of methods for finding the closest row/column edge, appending/inserting/deleting rows/columns, and moving cursor vertically/horizontally
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@55663 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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