Refactor screen layout code, start player progress code

src/playerprogress.ts

@@ -0,0 +1,34 @@
+import {Stat} from "./datatypes.ts";
+
+export class PlayerProgress {
+  #stats: Record<Stat, number>
+
+  constructor() {
+    this.#stats = {
+      AGI: 10,
+      INT: 10,
+      CHA: 10,
+      PSI: 10,
+    }
+  }
+
+  add(stat: Stat, amount: number) {
+    if (amount != Math.floor(amount)) {
+      throw `stat increment must be integer: ${amount}`
+    }
+    if (amount <= 0) {
+      throw `stat increment must be >0: ${amount}`
+    }
+    this.#stats[stat] += amount;
+  }
+
+  get(stat: Stat): number {
+    return this.#stats[stat]
+  }
+}
+
+let active: PlayerProgress = new PlayerProgress();
+
+export function getPlayerProgress(): PlayerProgress {
+  return active
+}