Limitless Structure Blocks

Removes structure block size limits and allows Chisel & Bits to work with Structure Blocks. 

Features:

• Removes the arbitrary limit built into structure blocks.
• Increases search range for corner blocks to 256. Any higher and the search gets very expensive.
• Tells Chisel & Bits to use its string save format when writing to structure block templates, allowing their blocks to be used in structure blocks properly.

Known Issues:

• Any time the mode on a structure block is changed, it will not update properly. Change it a second time to make it work properly. Very, very annoying.