P1nero's Better Structure Block

Extends the original structure block.

It's very useful to the author who wants to add EPIC STRUCTURES into mod using datapack.

• Removed the size limit of 48 * 48 * 48 from the vanilla version. But a structure which is too large may take times to save or load (or StackOverflowError!). 
• Add a new config: whether to load the structure immediately when the world load the structure block so that you can store structure block inside a structure. And then when the structure load, it will active the structure block inside it without redstone. Therefore you can generate a very large structure faster without StackOverflowError. By using "store structure block inside a structure", you can also create a structure group that are facing same side! (For example, a village with windmills)
• Add a new config that can hide the structure block message in survival mode. It will give a better feeling to player.
• Add a new config that can destroy the structure block after loading structure.