bug report: how to fix structure generation issues

Not applicable
Issue description

so if i restrict a structure to a grass block Mcreator will only look for one grass block to spawn the structure on, which if it is on hilly terrain it might get half the structure spawing in a cliff or in air, i think it should be fixed by making it look for a patch of grass that is the same size as the structure, for example if the structure is 4x4 it looks for a 4x4 patch of grass to spawn it on not a 1x1, 2x2, or 3x3 patch of grass. because i recently created a structures mod and most of the times i see the structures half floating in air off a clif or inside a cliff.

Issue comments

If you want to check for patches, use custom conditions for this.

This was added exactly for more complex detection types.