Add support 1.20.4

Fix bug

Plugin rewritten. The functionality is the same, but you can now place it directly on the Display block.
You can also hold down Shift to place it directly inside another block.

New permissions:

displayentitybuildtool.gui.slab
default: op
displayentitybuildtool.gui.stairs
default: op
displayentitybuildtool.place
default: op
displayentitybuildtool.break
default: op

Update to 1.20.1