refactor namespaces and imports (#670)

* re-namespace

* optimize usings

* more usings

* more of the same

* more implicit/global usings

* cleanup all usings

* minor fixes

ErsatzTV/Formatters/ConcatPlaylistOutputFormatter.cs

@@ -1,27 +1,23 @@
-using System;
-using System.Text;
-using System.Threading.Tasks;
+using System.Text;
 using ErsatzTV.Core.FFmpeg;
-using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc.Formatters;
 using Microsoft.Net.Http.Headers;
 
-namespace ErsatzTV.Formatters
+namespace ErsatzTV.Formatters;
+
+public class ConcatPlaylistOutputFormatter : TextOutputFormatter
 {
-    public class ConcatPlaylistOutputFormatter : TextOutputFormatter
+    public ConcatPlaylistOutputFormatter()
     {
-        public ConcatPlaylistOutputFormatter()
-        {
-            SupportedMediaTypes.Add(MediaTypeHeaderValue.Parse("text/plain"));
+        SupportedMediaTypes.Add(MediaTypeHeaderValue.Parse("text/plain"));
 
-            SupportedEncodings.Add(Encoding.UTF8);
-            SupportedEncodings.Add(Encoding.Unicode);
-        }
-
-        protected override bool CanWriteType(Type type) => typeof(ConcatPlaylist).IsAssignableFrom(type);
-
-        public override Task WriteResponseBodyAsync(OutputFormatterWriteContext context, Encoding selectedEncoding) =>
-            // ReSharper disable once PossibleNullReferenceException
-            context.HttpContext.Response.WriteAsync(((ConcatPlaylist) context.Object).ToString());
+        SupportedEncodings.Add(Encoding.UTF8);
+        SupportedEncodings.Add(Encoding.Unicode);
     }
-}
+
+    protected override bool CanWriteType(Type type) => typeof(ConcatPlaylist).IsAssignableFrom(type);
+
+    public override Task WriteResponseBodyAsync(OutputFormatterWriteContext context, Encoding selectedEncoding) =>
+        // ReSharper disable once PossibleNullReferenceException
+        context.HttpContext.Response.WriteAsync(((ConcatPlaylist) context.Object).ToString());
+}