Merge of SOC2010_RTC_IMAGES branch.
Added floating images and image property dialog to wxRichTextCtrl, by Mingquan Yang as part of GSOC 2010. Also changed image block creation to use a memory stream instead of creating a temporary file. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65676 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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