Obe's Building Gadgets

First release on CurseForge.

• Building Gadget: Surface, Wall, Floor, Line and Fill; Solid box, Frame, Hollow box and Walls between two corners; Stair, Circle (or cylinder) and Sphere.
• Exchanger: swap a square, one kind of block, connected blocks, or a box between two corners.
• Destruction Gadget: clear a box, a ball or a round tunnel, dig stairs down, or drain water and lava.
• Copy-Paste Gadget: copy or cut a box and paste it turned any way.
• Survival-friendly: blocks come from your inventory, breaks give normal drops, undo refunds.
• Controller, touch and keyboard friendly: one-button use, a grouped mode menu, sneak twice for the menu, sneak + scroll to change mode.