Small changes to accommodate the new material manager.
Updated the examples to reflect the new object color functionality (see https://github.com/MasDennis/Rajawali/commit/f848272f7d82642e4c439e3e197a7dcfc227f1a2)
Updated examples
Updated examples after geometry optimisation push (https://github.com/MasDennis/Rajawali/commit/0baa47fdc29fa6670a8a3560099e231d57a15580)
Also added a new colored line segments example and refactored a bit.
Added an orthographic camera example and did further refactoring and grouping.
Added a new camera animation example. Using a catmull rom spline as its path.