"Get [block/item/entity] name" procedure block

Issue description

This procedure block gets the name of a block, an item or an entity (and not the id). It would be nice if it also works with custom names (items renamed using anvils or mobs renamed using name tags/spawned using renamed spawn eggs).

This is a little feature that could be useful when printing the name of a block a player is looking at, the name of a block another block is bound to (for example a ranged block placer/destroyer), the name of a pet when it dies...

Issue comments

I will add get entity and item stack name procedure blocks in 1.8.3. For blocks, I did not find a good way to do this and if I do I will add the option for blocks too.