[pvr] fix open add timer dialog in timer window

After changing the special item 'Add timer...' to be a folder (to always
stay on top of the list) the path comparison fails, because the path now
ends with a slash.
Includes: Replace includes with "sub-includes" if possible.
Includes: Remove unnecessary includes.
[win32] Add giflib.
[depends] - add giflib support
[gif] - Add proper gif implementation.
[TextureManager] Use new gif implementation.
[win32] Remove now unused AnimatedGif class.
[GUITexture] Change animation code.
[*RFC*][GUITexture] Add m_animated to CTextureInfo and set it when filename is set.
[Gif] Make a gif an iimage.
[linux] - add optional gif support.
[application] - small refactor for user splash handling (allow Splash.gif)
[Splash/GUIImage/GUITexture] - make the splash aware of animations
[application] - render the splash during render() and process it in framemove if it is animated - do this until the animation was finished at least once to the end