implemented save file compression in browser

src/config/games.ts

@@ -0,0 +1,20 @@
+// Games the parser backend can handle. The values go into the upload request.
+//TODO: add more games
+export enum GameEnum {
+    EU4 = 'eu4',
+    Stellaris = 'stellaris',
+}
+
+/**
+ * Name the game state gets inside a save archive, per game.
+ *
+ * A save produced by the game is either a zip archive holding this file (plus
+ * companion files like `meta`), or the very same content as plain text. When a
+ * plain text save is uploaded, this is the name it is stored under, so the
+ * backend always reads the 'gamestate' or whatever is set for the specific game.
+ * The parser backend keeps the same map on its side.
+ */
+export const GAME_SAVE_ENTRY_NAMES: Record<GameEnum, string> = {
+    [GameEnum.EU4]: 'gamestate',
+    [GameEnum.Stellaris]: 'gamestate',
+}