refactor: convert to ECMAScript where necessary

Also drop @league-of-foundry-developers/foundry-vtt-types.

src/settings.ts

@@ -1,53 +0,0 @@
-// SPDX-FileCopyrightText: 2021 Johannes Loher
-//
-// SPDX-License-Identifier: MIT
-
-import { getGame } from "./utils/utils";
-
-export function registerSystemSettings(): void {
-    const game = getGame();
-
-    /**
-     * Track the migrations version of the latest migration that has been applied
-     */
-    game.settings.register("ds4", "systemMigrationVersion", {
-        name: "System Migration Version",
-        scope: "world",
-        config: false,
-        type: Number,
-        default: -1,
-    });
-
-    game.settings.register("ds4", "useSlayingDiceForAutomatedChecks", {
-        name: "DS4.SettingUseSlayingDiceForAutomatedChecksName",
-        hint: "DS4.SettingUseSlayingDiceForAutomatedChecksHint",
-        scope: "world",
-        config: true,
-        type: Boolean,
-        default: false,
-    });
-
-    game.settings.register("ds4", "showSlayerPoints", {
-        name: "DS4.SettingShowSlayerPointsName",
-        hint: "DS4.SettingShowSlayerPointsHint",
-        scope: "world",
-        config: true,
-        type: Boolean,
-        default: false,
-    });
-}
-
-export interface DS4Settings {
-    systemMigrationVersion: number;
-    useSlayingDiceForAutomatedChecks: boolean;
-    showSlayerPoints: boolean;
-}
-
-export function getDS4Settings(): DS4Settings {
-    const game = getGame();
-    return {
-        systemMigrationVersion: game.settings.get("ds4", "systemMigrationVersion"),
-        useSlayingDiceForAutomatedChecks: game.settings.get("ds4", "useSlayingDiceForAutomatedChecks"),
-        showSlayerPoints: game.settings.get("ds4", "showSlayerPoints"),
-    };
-}