- Changed the visibility of some ResourcesManager methods related to the Observer pattern from protected to public.
- Added a new protected, virtual and empty method ResourcesManager::initializeResourcesSelection().
- Added missing calls to initializeResourcesSelection() in ResourcesManager code.
- Removed default empty constructor from DrawablesSelection.
- ResourcesManager::createResourcesSelection() method now accepts a variable number of arguments to be passed to the constructor of the new selection.
- Removed virtual ResourcesManager::initializeResourcesSelection() method.
- Readded DrawablesManager's empty constructor.