reformat some loplugin code

to match our more normal conventions.

Also drop the 'using std' and some other cruft

Change-Id: I02ef81c5427188bc03a20b157a57a900a9d7bf0d

compilerplugins/clang/checkconfigmacros.cxx

@@ -48,7 +48,7 @@ class CheckConfigMacros
         enum { isPPCallback = true };
     private:
         void checkMacro( const Token& macroToken, SourceLocation location );
-        std::set< string > configMacros;
+        std::set< std::string > configMacros;
     };
 
 CheckConfigMacros::CheckConfigMacros( const InstantiationData& data )