Improve wxGrid cell wrapping in wxGridCellAutoWrapStringRenderer.

Wrap the words too long to be shown on one line on several lines.

Also take the line breaks and TABs into account.

Closes #15249.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74245 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775