Add new command `path:dig` which will excavate for you without adding any blocks.
`up|down` will dig a stair step passage (1 forward, and 1 up|down), `ahead` will dig straight ahead, and `vup|vdown` will dig straight up or down from 1 block in front of you.

For example, `path:dig down 20` will dig a stair step passage 20 blocks long going down 1 block at a time.

Additionally, this release supports **SILK_TOUCH** and **FORTUNE** when collecting material, and **UNBREAKING** when calculating tool damage. (_NOTE the calculations are not exactly the same as in regular Minecraft, but they are pretty close_).