ness-engine version 1.4.8

1. fixed memory leak in text entities (important update!).
2. added Viewport object! very useful to create scenes within a limited region or alpha mask, for split-screen aplication and post-render effects!
3. added new example projects, and added debug-draw for Box2d in the physics example - a useful snippet you can take when using Box2d.
4. entities and nodes can now delete user-attached objects automatically (you decide when you set them).
5. some work on the GUI system (not ready yet).
6. added optional shadow to text entities.
7. some optimizations in code.
8. added function to render line and circles.
9. fixed a critical bug with multiple z-nodes.
10. improved the mouse and keyboard event handlers, can now detect clicks and the moment the button is pressed / released (and not just is_down() state like before).
11. fixed bug that when transforming a scene sometimes objects lower in hirarchy did not update.
12. added option to camera to still affect static entities - this is mostly for internal usage.