Use cave colors for dirt-tile of modern graphic sets

[cwscws]

Modern graphic sets are very promising and can enhance the gaming experience a lot (like the boulder_rush.png set).

But they have one drawback: The colors set for each cave can not be used.

To have a more C64-like gaming experience with different colors in each cave it would be nice to have at least the dirt tile using the colors set for the cave (dirt, dirt 2, biter switch, dirt ball, loose dirt, sloped dirt, glued dirt).

In my opinion the dirt alone would be enough.

Enclosed a picture with a sample of my idea.

[cwscws]

If anybody wants my latest graphics set can download the enclosed one.