Upgrade to Vue 3

- Updated code and tooling
- Change some component names to comply with the rules of multiple words
- Patch StSound library to allow passing a rate option, which is needed
  as the default assumes 44100 Hz but WebAudio runs at 48000 Hz in some
  cases

.eslintignore

@@ -1,5 +1 @@
-/build/
-/config/
-/dist/
-/*.js
-/test/unit/coverage/
+/stsound/

.eslintrc.cjs

@@ -0,0 +1,15 @@
+/* eslint-env node */
+require('@rushstack/eslint-patch/modern-module-resolution')
+
+module.exports = {
+  root: true,
+  'extends': [
+    'plugin:vue/vue3-essential',
+    'eslint:recommended',
+    '@vue/eslint-config-prettier/skip-formatting'
+  ],
+  parserOptions: {
+    ecmaVersion: 'latest'
+  },
+  ignorePatterns: ['**/stsound/**']
+}

.prettierrc.json

@@ -0,0 +1,8 @@
+{
+  "$schema": "https://json.schemastore.org/prettierrc",
+  "semi": false,
+  "tabWidth": 2,
+  "singleQuote": true,
+  "printWidth": 100,
+  "trailingComma": "none"
+}

README.md

@@ -16,7 +16,7 @@ npm install
 ### Building the ST-Sound library Emscripten port
 
 ```bash
-docker run --rm -v $PWD/stsound:/data -w /data emscripten/emsdk:1.39.15 emmake make clean libym.js
+docker run --rm -v $PWD/stsound:/data -w /data emscripten/emsdk:3.1.66 emmake make clean libym.js
 ```
 
 ### Generating the songs JSON index file
@@ -27,14 +27,11 @@ npm run scan-songs
 
 ### Running in development mode
 
-⚠️ In development mode you must manually copy `stsound/libym.wasm` to the
-root of the project.
-
 ```bash
 npm run dev
 ```
 
-This will serve the app at http://0.0.0.0:8080/ with hot reload.
+This will serve the app at http://localhost:5173/ with hot reload.
 
 ### Building the production version