Rename game to edition in the UI

Much clearer to say Classic vs Special Edition instead of "skyrim" vs "skyrimspecialedition".

lib/games.ts

@@ -0,0 +1,8 @@
+export type GameName = "skyrim" | "skyrimspecialedition";
+
+// Translates gameName (e.g. "skyrim" or "skyrimspecialedition") to edition name which is displayed in the
+// UI ("Classic" or "Special Edition").
+export const editionNames: Record<GameName, string> = {
+  skyrim: 'Classic',
+  skyrimspecialedition: 'Special Edition',
+};