- Changed SFML API to receive an sf::String as the window title instead
of a std::string (in Window::Window and Window::setTitle).
- Changed RenderWindow and WindowImpl APIs accordingly.
- Changed WindowImplWin32 to use a Unicode window title only if the
target OS supports it.
- Changed WindowImplCocoa to always use Unicode window titles and added
a utility function to Window/OSX/cpp_objc_conversion.mm.
- Changed WindowImplX11 to set the Unicode window title as part of the
_NET_WM_NAME specification, which sadly is not part of the official X
standard, but the closest anything can get. Still set regular ASCII
title as fallback.
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