src/OpenFOAM: Rationalised use of enumerations by using the C++11 scoped form

for

    db/functionObjects/timeControl/timeControl.H: timeControls
    primitives/bools/Switch/Switch.H: class switchType
    primitives/strings/fileName/fileName.H: fileType
    primitives/strings/wordRe/wordRe.H: compOption

applications/utilities/postProcessing/dataConversion/foamToEnsightParts/findFields.H

@@ -37,7 +37,7 @@ if (timeDirs.size())
       / timeDirs.last().name()
       / regionPrefix
       / cloud::prefix,
-        fileName::DIRECTORY
+        fileType::directory
     );
 
     forAll(cloudDirs, cloudI)