"ceiling" structure spawntype for nether and other structure thing

Status
Fixed
Issue description

it would be nice if there was a ceiling spawn type for nether so i could make like a hanging strucutre or soemthing,

maybe it could even work in overwrold using caves

and it would be ncie to have a option  to make  it check for space to spawn like a checkbox to it cant spawn floating off the edge 

 

also, a thing that i want is a checkbox to make the /locate command work on it if possible,

Issue comments

I don't think one can add custom structure to locate command yet.

For hanging structures, I will add this if I come up with an efficient algorithm to implement this in a good way as Minecraft does not have any built-in method to detect "ceiling".