Support checkName in errorFormat

src/dscanner/analysis/run.d

@@ -105,6 +105,7 @@ void messageFunctionFormat(string format, Message message, bool isError)
 	s = s.replace("{column}", to!string(message.column));
 	s = s.replace("{type}", isError ? "error" : "warn");
 	s = s.replace("{message}", message.message);
+    s = s.replace("{name}", message.checkName);
 
 	writefln("%s", s);
 }

src/dscanner/main.d

@@ -376,6 +376,8 @@ Options:
     --errorFormat|f <pattern>
         Format errors produced by the style/syntax checkers. The default
         value for the pattern is: "%2$s".
+        Supported placeholders are: {filepath}, {line}, {column}, {type},
+        {message}, and {name}.
 
     --ctags <file | directory>..., -c <file | directory>...
         Generates ctags information from the given source code file. Note that