This patch adds a layer called "gore". This layer can be used to add tiles that might be considered violent. If the blood and corpses setting is turned off the "gore" layer will not be drawn.
Currently it does not follow the naming convention of layers. If it is to follow then either some layers need to be renamed or the "gore" layer could be called "2.5_gore".
There could optionally be a "roof_gore" layer to add to the roof layers group.