Magic Cube

Remove all files that have been separated into a new library 'objectlib'

Prepare the 'objectlib' package to be separated into a library module

Refactoring: split the 'objects' package into two, 'objects' and 'objectlib'.
The point: we're going to need to move the 'objectlib' stuff into its own library module, and that's because we're going to create a new app module which needs access to it.

New 'tutorial' activity.

Rename some classes.

Speed up WinEffectGlow - MEDIUM quality is fully enough.

Convert the PostRender to a PreRender, called before we render.
This makes more sense as this way things are prepared for the very first render.

Smaller halo.

Change the Postprocessing effects: separate the radius and the halo.
Reason: we needed a way to specify the size of the halo around a postprocessed object; before it was automatically (and not very correctly) computed from the radius - before we knew the size of the object's bounding box, so this automatic computation was possible. Now we're removing the MashBase.getBounding(0 API, so the size of the halo has to be explicitly given by the user. This way is more correct anyway and gives the user more control (as the Multiblur app proves!)...

Adjust the app to match the changes in library.

Looks like we'll have to add 1 dim to the GLOW effect.