Fixed mouse clicks not activating windows (Win32)

- This fixes issue #437.
- This also restores system shortcuts like Alt+F4 or Alt+Space.
Merge pull request #457 from MarioLiebisch/issue-437

Fixed mouse clicks not activating windows (Win32) (#437, #455)
Fixed minor warning about member initialization order in sf::SoundRecorder
Fixed Window::setSize not working without the sf::Style::Resize style (#466)
Fixed compiler warnings in sf::Rect (#458)
Fixed minor compiler warnings in sf::Text
Removed support for Windows 9x (required deprecated functions) (#469)
Updated Xcode's templates readme
Merge branch 'master' of https://github.com/LaurentGomila/SFML.git into timer_resolution_fix