Added Nightbot integration. Changed from client credentials flow to implicit code grant flow.

Nightbot/NightbotApiClient.cs

@@ -0,0 +1,60 @@
+using System.Text.Json;
+using TwitchChatTTS.Helpers;
+using Serilog;
+using TwitchChatTTS;
+
+public class NightbotApiClient
+{
+    private readonly ILogger _logger;
+    private readonly WebClientWrap _web;
+
+
+    public NightbotApiClient(
+        ILogger logger
+    )
+    {
+        _logger = logger;
+
+        _web = new WebClientWrap(new JsonSerializerOptions()
+        {
+            PropertyNameCaseInsensitive = false,
+            PropertyNamingPolicy = JsonNamingPolicy.SnakeCaseLower
+        });
+    }
+
+    public async Task Play()
+    {
+        await _web.Post("https://api.nightbot.tv/1/song_requests/queue/play");
+    }
+
+    public async Task Pause()
+    {
+        await _web.Post("https://api.nightbot.tv/1/song_requests/queue/pause");
+    }
+
+    public async Task Skip()
+    {
+        await _web.Post("https://api.nightbot.tv/1/song_requests/queue/skip");
+    }
+
+    public async Task Volume(int volume)
+    {
+        await _web.Put("https://api.nightbot.tv/1/song_requests", new Dictionary<string, object>() { { "volume", volume } });
+    }
+
+    public async Task ClearPlaylist()
+    {
+        await _web.Delete("https://api.nightbot.tv/1/song_requests/playlist");
+    }
+
+    public async Task ClearQueue()
+    {
+        await _web.Delete("https://api.nightbot.tv/1/song_requests/queue");
+    }
+
+    public void Initialize(string clientId, string accessToken)
+    {
+        _web.AddHeader("Authorization", "Bearer " + accessToken);
+        _web.AddHeader("Client-Id", clientId);
+    }
+}