changed structure of breadcrumbs array [2.7.0]

This version introduces multiple enhancements:

changed data of breadcrumbs array to return also full path to page and active status
some code refactor

Details of additions/deletions below:
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Modified:   /BLUE_FRAMEWORK/packages/CORE/tree_class.php
            -- Added --
                $_breadcrumbsPath to store path for page in breadcrumbs
                _setActivePage to set last page in breadcrumbs to active
            -- Updated --
                __construct to run method responsible for set breadcrumbs page as active
                _breadcrumbs to handle new structure
                _external changed method name
                _load changed method name from load to _load with some code refactor