gnu: Rename some games to match upstream project name.

* gnu/packages/games.scm (armagetronad):
(cataclysm-dda):
(abbaye):
(wesnoth):
(wesnoth-server):
(starfighter):
(kiki):
(fillets-ng):
(crawl):
(crawl-tiles):
(tome4):
(btanks):
(battle-tanks):
(edgar): Use these as the package definition.
(armagetron-advanced):
(cataclysm-dark-days-ahead):
(l-abbaye-des-morts):
(the-battle-for-wesnoth):
(the-battle-for-wesnoth-server):
(project-starfighter):
(kiki-the-nano-bot):
(fish-fillets-ng):
(dungeon-crawl-stone-soup):
(dungeon-crawl-stone-soup-tiles):
(tales-of-maj-eyal):
(the-legend-of-edgar): Turn these into obsolete aliases.

This reverts renames made by the following commits:
f95e33a7
b1aee9fc
f6a21d61
24a67aef
36a0b5b4
8b6e2bc1
6639295f
184f5c8d
ecdb1348
375cb941
c91ed484
973bd8a6
df42e0f9