Gamemode realistic (new /gamemode) (for tools)

Its gamemode for more realistic interaction of blocks and tools.

For example, a wooden pickaxe can only break stone, stone pickaxe can break already andesite, cobblestone, and decorative blocks of cobblestone, iron pickaxe can break already bricks, stone bricks and decorative blocks of bricks.
And so with all tools, except hoes, which are supposed to break only crops.

I think it's quite interesting and will complicate survival

P.S. Sorry, maybe bad english