Support for nested, weighted arrays in multi tiled sprites

[thedyze]

Is your feature request related to a problem? Please describe.

When doing sprite work, I would very much like to create variant tiles for multi tile walls. Today we are limited to one "regular" vertical, horizontal tile (see "edge" below).

Describe the solution you'd like

The ability to add nested arrays at each subtile array element would solve this problem, and would enable the ability to create a lot of visual variation.

Additional context

No response