[MC-102908] Structure voids are breakable

In the past, structure voids were unbreakable, similar to structure blocks and command blocks.

Linked issues

Set confirmation status to community consensus, as the wiki also states this change.

Tan Chin Cheern 2016-06-03T01:06:46Z

Wiki states that Structure Blocks were changed from a blast resistance of about 18000003 to none or 0.

The blocks should have no use at all. If you cannot break them they would be 'walkthrough barrier' which they are not intended to be.