Have monster corpses use the species for colour instead of type.

This is how we had corpses inherit colour before the monster colour
change.
Let Killer Klowns be as colourful in death as they were in life

Gives Killer Klowns a species so their corpses can have colour
ETC_RANDOM. Also, let their corpse in Tiles essentially be
ETC_RANDOM. The results are Komedic.

This commit also cleans up some of the orderings in the corpse tile
listing.
Remove an unused macro