Re-added Ogre's glew implementation;
Updated CMake to not use ugdk's glew when building the 3D module;
Modified Ogre's glew to uncomment glewInit(), used by ugdk.
Implemented ugdk's OgreScene class;
-implemented basic OgreScene class to represent a 3D scene;
-implemented basic OgreEntity (from ugdk::action::Entity) class;
-moved Camera class from bulletworks to ugdk::action::3D, and updated it to use new classes;
-updated 3D graphics Manager to have getters for the Ogre Root and RenderWindow;
-Updated Engine and Scene to have a virtual OnPushed method;
-Updated 3D module src list accordingly;
-Fixed ugdk src list, removing bulletworks sources from it;
3D Manager now receives and uses SDL window from UGDK - thus SDL/Ogre are using the same window, which means everything *should* work normally
-Moved ugdk::graphics::threed namespace to ugdk::desktop::threed
-Removed ogre_window_title from system::Configuration
-Updated 3D manager to receive a UGDK window (desktop::Window) and create Ogre's window based on it
-Updated engine to initialize 3D manager after desktop manager
-some other minor stuff, related to the above.