Re-durability

This minecraft mod changes minecraft durability system. First of all, all items are unbreakable, but the lower durability is the stats of item are decreased. Items now have durability stages, when durability is lower than this stage then item stats are lower. Durability stages depend on the type of item. Items added by other mods, are affected too, but these items have default settings of durability stages, however it is easy to change durability stages of other mods items by yourself.