Stacking in any direction

Because it's terribly frustrating that it's impossible to make a grand
staircase mine in worldedit. If it's a 4x4 area, that needs a 1 block
overlap to tessellate

//stack2 100 0/-3/-3

and it'll descend at a 45 degree angle along the negative z-axis.

It's a bad naming convention I know. Just wanted something working
before I tried to think of a good name besides
"repetitivecopyinanydirectionthingy".