Added and applied styles for private readonly fields, private fields to Extensions and Common folders.

- Some renamings and code cleanups
- Chained method calls, binary expressions and binary patterns will now break into newlines
- Type param constraints and base constructor calls will be on the new line

src/NadekoBot/Common/JsonConverters/Rgba32Converter.cs

@@ -0,0 +1,14 @@
+using SixLabors.ImageSharp.PixelFormats;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace NadekoBot.Common.JsonConverters;
+
+public class Rgba32Converter : JsonConverter<Rgba32>
+{
+    public override Rgba32 Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+        => Rgba32.ParseHex(reader.GetString());
+
+    public override void Write(Utf8JsonWriter writer, Rgba32 value, JsonSerializerOptions options)
+        => writer.WriteStringValue(value.ToHex());
+}