* Implemented BestSize cache
* Added calls to InvalidateBestSize where things affecting BestSize
are modified. There are probably several other places where this
still needs to be done...
* Added wxWindowBase::GetBestFittingSize that will merge the BestSize
into the MinSize, (if any) and return the result.
* SetBestFittingSize will now only set the MinSize to the value that
was passed to it, without merging in the BestSize
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@28010
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