Change default graphics from ChestHole to DeadPeople

[I-am-Erk]

Is your feature request related to a problem? Please describe.
ChestHole is updated less frequently than DeadPeople and contains a number of missing tiles.

Describe the solution you'd like
DeadPeople is a popular tileset that is frequently updated. It would be a good choice for default.

Describe alternatives you've considered
Not changing the default, and getting someone to update ChestHole.

Additional context
At some point soon it might be worthwhile to go through our included graphics sets and remove some of the less well maintained ones from the mainline.

[FulcrumA]

I recall ChestHole's work fondly, especially since it was the first largely complete tileset and a labour of love of a player wanting to add graphics for some friends who had hard time with CDDA otherwise. I do have to agree though, it's kind of behind now, while DeadPeople is both relatively up-to-date and quite approachable for average player compared to many alternatives.

I'd certainly be fine with making it a default.

[I-am-Erk]

Totally. I don't mean it as a negative to chesthole, and if I ever get tired of writing I might pick up the ol' tablet and update chesthole. However for the moment, I think the more complete set should be the default.