v0.6.0 - Natural mining speed + keybind fix

Boring no longer happens instantly. You now mine the block you're looking at at normal vanilla speed, and the moment it breaks the whole layer bores and the selection advances. Hold left-click to chew straight down (or along a tunnel) layer by layer at that natural pace. Clear Selection keybind moved from C (which conflicts with other mods) to Delete - rebindable in Controls. Requires Fabric Loader + Fabric API on MC 1.21.