Documentation: Removed obsolete copyright notice

Yagisan's commit c69c83c56d77870668ccb2bdac3a90570dea384f from 2008 is
no longer relevant as the file has been completely rewritten since;
SDL is no longer used for window management.
Merge branch 'master' into oculus-refactor
Documentation|libappfw: Added API documentation for VRConfig
Refactor|libappfw|Client|Stereo 3D: Relocated window transforms

WindowTransform and VRWindowTransform were moved to libappfw. They now
work together with BaseWindow, a new abstract base class for application
windows.

The client's VRConfig instance was relocated to BaseGuiApp, where it can
be accessed by VRWindowTransform instances.

ClientWindow implements BaseWindow.
UI|Ring Zero: Tweaks to game selection menu

The height of the game session buttons is now determined more correctly
based on the height of four lines plus the margins of the widget.

Games are now sorted by identity key rather than title (customizable
sorting is upcoming).
libappfw: Added convenience header for BaseWindow