Update FindSDL2_X modules
Forgot some regex commands
Handle the colorkey presence at Surface level
Fix transition (works but not finished)
Create the window once we know the final outset size
Remove SDL environment variables
Merge remote branch 'origin/master' into sdl2
Pixels can have both colorkey and alpha channel
Fix is_pixel_transparent
reorganize is_pixel_transparent
Fix compilation warnings.
Show a message box in case of fatal error.
Update ChangeLog about SDL2.
Merge remote branch 'origin/master' into sdl2
Use Debug::die for fatal errors
Check if window is created when calling VideoManager::get_window_title (should be useless but since it's not painful...)
Don't include sdl header before main() definition
Use separate assertion for the window and the renderer
Revert "Don't include sdl header before main() definition"

This reverts commit 7df5e183678f296dd004c816e6eb0b8b187c0b76.
Use normal fullscreen mode with iOS