general docview.cpp code cleanup; use wxVector<> instead of manually-allocated arrays; refactor wxDocManager::CreateDocument() and allow using wxDOC_SILENT with wxDOC_NEW; cleanup wxFileHistory code
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@54965 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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