New Webserver and WebApp (#942)

* Replace the WCF webserver with an ASP.NET Core webserver (VocaluxeWeb)

- New project VocaluxeWeb: ASP.NET Core 2.3 (Kestrel) on .NET Framework 4.8.1, HTTP or HTTPS
  with a self-signed certificate, REST API (/api/v1) with Swagger, live events (Server-Sent Events)
- Access to the game only through IVocaluxeRemote; requests run on the main thread once per frame
- Sessions with roles (guest, player, admin) and configurable permissions, PINs hashed with PBKDF2
- Queue as a playlist with requesters and singers, fair order (one song per person and round)
- Admin: settings, server status, logged-in devices, activate/deactivate and delete profiles
- Profile pictures: own photo or one of the Vocaluxe avatars
- Game: WebApp queue screen (song options, playlist group) to start the next song with the chosen
  singers, return to it after singing, warning when the webserver is off, remote keyboard
- Old WCF server, WebserverInitalConfig and URL reservations removed; libraries moved to libs/managed
- Unit tests for PIN hashing, settings and permissions, queue order and device names
- AppVeyor: Visual Studio 2022 image and Node.js 24 (the build compiles the WebApp)
- Documentation in VocaluxeWeb/README.md

* New WebApp (Vue 3, TypeScript, Vite) replacing the old jQuery Mobile website

- Login with profile and PIN, create profiles
- Songs with search, filters, sorting and 30 second previews
- Queue: add songs with game mode, audio and singers, edit, reorder, start in the game
- Playlists: create, edit, add to the queue
- Now playing with live updates, remote control and keyboard
- Players: own profile with picture (photo or Vocaluxe avatar), roles for admins
- Admin settings: permissions, server status, devices, profiles
- Help page, responsive layout for phones, tablets and desktops, light and dark mode
- Texts in WebApp/src/locales/en.json, translated with Transifex
- Old website and PhoneGap config removed

---------

Co-authored-by: Florian Ostertag <flokuep@users.noreply.github.com>

WebApp/index.html

@@ -0,0 +1,17 @@
+<!doctype html>
+<html lang="de">
+  <head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover" />
+    <meta name="theme-color" content="#14121c" />
+    <meta name="apple-mobile-web-app-capable" content="yes" />
+    <link rel="manifest" href="/manifest.webmanifest" />
+    <link rel="icon" type="image/png" href="/icon.png" />
+    <link rel="apple-touch-icon" href="/icon.png" />
+    <title>Vocaluxe</title>
+  </head>
+  <body>
+    <div id="app"></div>
+    <script type="module" src="/src/main.ts"></script>
+  </body>
+</html>