grid renderer abstract [0.4.0]

This version introduces multiple enhancements:

added method to change single row data, also added events for grid render method

Details of additions/deletions below:
--------------------------------------------------------------

Modified:   /Lib/Core/Render/View/Grid.php
            -- Added --
                changeRowData to change single row data
            -- Updated --
                added tracer and event handler, added changeRowData method

Modified:   /doc/events.md
            -- Added --
                new events

Modified:   /Lib/Core/Render/etc/config.ini
            -- Modified --
                changed version from 0.3.0 to 0.4.0