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>

VocaluxeWeb/IVocaluxeRemote.cs

@@ -0,0 +1,92 @@
+#region license
+// This file is part of Vocaluxe.
+//
+// Vocaluxe is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Vocaluxe is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Vocaluxe. If not, see <http://www.gnu.org/licenses/>.
+#endregion
+
+using System;
+using System.Collections.Generic;
+using VocaluxeWeb.Remote;
+
+namespace VocaluxeWeb
+{
+    /// The only view the webserver has on the game. Implemented by Vocaluxe.
+    /// Methods marked as main-thread-only must be called through <see cref="Dispatching.CMainThreadDispatcher" />.
+    public interface IVocaluxeRemote
+    {
+        /// Full version text of the running Vocaluxe. Thread-safe.
+        string Version { get; }
+
+        /// False while the game is still loading (songs, playlists). Main thread only.
+        bool IsReady { get; }
+
+        /// Current state of the game. Main thread only.
+        RemoteState GetState();
+
+        #region profiles
+        /// All profiles, sorted by name. Main thread only.
+        IList<RemoteProfile> GetProfiles();
+
+        /// Creates a profile and returns its id. Main thread only.
+        Guid CreateProfile(ProfileChange change);
+
+        /// Changes the given fields of a profile. Main thread only.
+        void UpdateProfile(Guid profileId, ProfileChange change);
+
+        /// Deletes a profile including its file. Main thread only.
+        void DeleteProfile(Guid profileId);
+
+        /// Avatars that come with Vocaluxe or were put into the profile folder (not the ones uploaded with the WebApp). Main thread only.
+        IList<RemoteAvatar> GetAvatars();
+        #endregion
+
+        #region songs
+        /// Changes whenever songs are added or (re)loaded. Main thread only.
+        int SongLibraryVersion { get; }
+
+        /// All songs. Main thread only.
+        IList<RemoteSong> GetSongs();
+        #endregion
+
+        #region playlists
+        /// All playlists with their songs. Main thread only.
+        IList<RemotePlaylist> GetPlaylists();
+
+        /// Creates an empty playlist and returns its id. Main thread only.
+        int CreatePlaylist(string name);
+
+        /// Main thread only.
+        void RenamePlaylist(int playlistId, string name);
+
+        /// Main thread only.
+        void DeletePlaylist(int playlistId);
+
+        /// Replaces all songs of a playlist and saves it. Main thread only.
+        void SetPlaylistEntries(int playlistId, IList<RemotePlaylistEntry> entries);
+        #endregion
+
+        #region game
+        /// Starts singing a song with the given players (skipping the player selection if possible). Main thread only.
+        ERemoteStartResult StartSong(RemoteStartRequest request);
+        #endregion
+
+        #region input
+        /// Sends a key press to the game as if it came from a keyboard. Thread-safe.
+        void SendKey(ERemoteKey key);
+
+        /// Types text into the game. Thread-safe.
+        void SendText(string text);
+        #endregion
+    }
+}