Add a verbose mode: -S verbose

src/ShellCheck/Formatter/Format.hs

@@ -47,6 +47,7 @@ severityText pc =
         WarningC -> "warning"
         InfoC    -> "info"
         StyleC   -> "style"
+        VerboseC -> "verbose"
 
 -- Realign comments from a tabstop of 8 to 1
 makeNonVirtual comments contents =

src/ShellCheck/Formatter/TTY.hs

@@ -57,6 +57,7 @@ colorForLevel level =
         "warning" -> 33 -- yellow
         "info"    -> 32 -- green
         "style"   -> 32 -- green
+        "verbose" -> 32 -- green
         "message" -> 1 -- bold
         "source"  -> 0 -- none
         _ -> 0         -- none