Better Basalt Delta Ash

The ash particles falling in basalt deltas are very obtrusive, and it’s especially noticeable when they phase through walls.

This pack:
– Makes the particles grey, closer to the color of basalt, and on average closer to the color of most other blocks. This makes them seem almost transparent in comparison to before.
– Decreases the size from 1/8 to 1/12. That is 2/3 of the width and 2/3 of the height of vanilla white_ash particles.

None of the atmosphere from the falling particles is lost.