Added interface for blocks with multiple highlight boxes and custom breaking animation for blocks

Working example: http://ilex.uk.to/1sg9iIc

And the animation: http://ilexiconn.uk.to/data/stuff/Minecraft_1.7.10_2014-08-07_14-27-00.png
                              http://ilexiconn.uk.to/data/stuff/Minecraft_1.7.10_2014-08-07_14-27-59.png
Main question is, WHY? You can have sub-hitboxes, why do you need to have MULTIPLE hitboxes at the SAME time?