Improvements

• upgrade postprocessing library, improving effects such as post/bloom.
• post/bloom: add object mask, enabling selective bloom.

Bug fixes

The blendFunction of some post nodes was not properly assigned, and this has been fixed. While the scene loader should be able to fix this when you load a scene created with a version before 1.2.11, be warry that if the post processing does not behave as before, double check that the blendFunction is the value you expect. And don't hesitate to get in touch for any bug.