avoided some unneeded conversions of string::npos, minor cleanup of className

- string doesn't use any debug info, remove it
- restructured the macros to add in NoDebug macro versions to className,
  typeInfo.  Might be helpful with tackling the globals bootstrapping issue.
- HashTableName + StaticHashTableName - avoid lookup of debug switch when
  FULLDEBUG is not defined

etc/controlDict

@@ -688,7 +688,6 @@ DebugSwitches
     steadyState         0;
     stl                 0;
     stochasticDispersionRAS 0;
-    string              0;
     supersonicFreestream 0;
     surfaceFeatures     0;
     surfaceInterpolation 0;