Position information for Autotiler Tiles

### I am planning on implementing this myself

Maybe

### Describe your request

the `Autotiler` already stores parts of the tileset image as `MTexture`s into each `Tile`, but I think it would be nice if it also stored the positions (`x` and `y`) where each of those tiles came from.
that'll be useful for mods looking to, for instance, make effects happen depending on which tile will appear (such as emitting light or bloom)

### Additional context

_No response_