Parse map models and validate them (#13)

The enhancements:
- Added map validation that checks for some common errors that maps have
- /take: Does map validation but will still take the map even if there are problems
- /take: Improved the help text and added links to the maptest places
- /submit: Does map validation and will not let you submit if there are problems
- /submissions: Now shows the map's display name and creator
- Added an ESLint config and tidied some things up
- Updated some of the packages

Reviewed-on: #13
Co-authored-by: Carter Penterman <carterpenterman@gmail.com>
Co-committed-by: Carter Penterman <carterpenterman@gmail.com>

eslint.config.mjs

@@ -0,0 +1,15 @@
+import globals from "globals";
+import pluginJs from "@eslint/js";
+
+
+export default [
+  {files: ["**/*.js"], languageOptions: {sourceType: "commonjs"}},
+  {languageOptions: { globals: globals.browser }},
+  pluginJs.configs.recommended,
+  {
+    rules: {
+      "no-unused-vars": ["warn", { "argsIgnorePattern": "^_" }],
+      "semi": "error"
+    }
+  }
+];