- Added a new ClientPrimitivesManager class. Instantiated in Scene class.
- Added code for executing remote primitive category commands in previous ClientPrimitivesManager class.
- Added getters to PrimitiveCategoryCommand and PrimitiveCategoryCreationCommand classes.
- Added a DEFINE_SHARED_POINTERS function macro.
- Added a AbstractPrimitivesManager used as a base class for ClientPrimitivesManager and ServerPrimitivesManager classes (all common code has been moved to AbstractPrimitivesManager).
- Minor fixes.