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/SmartText/SmartTextEmbedFooter.cs

@@ -2,10 +2,11 @@
 
 namespace NadekoBot;
 
+// todo test smarttextembedfooter and smarttextembedauthor
+
 public class SmartTextEmbedFooter
 {
     public string Text { get; set; }
-    public string IconUrl { get; set; }
     [JsonProperty("icon_url")]
-    private string Icon_Url { set => IconUrl = value; }
+    public string IconUrl { get; set; }
 }