ENH: reduce reliance on stringListOps functions

- findStrings, findMatchingStrings now mostly covered by matching
  intrinsics in wordRe and wordRes.

  Add static wordRes match() and matching() variants

COMP: remove stringListOps include from objectRegistry.H

- was already noted for removal (NOV-2018)

applications/utilities/postProcessing/dataConversion/foamToEnsight/checkFieldAvailability.H

@@ -26,7 +26,7 @@ forAll(meshes, regioni)
 {
     const auto& mesh = meshes[regioni];
 
-    IOobjectList objects(0);
+    IOobjectList objects;
 
     if (doConvertFields && !timeDirs.empty())
     {

applications/utilities/postProcessing/dataConversion/foamToVTK/foamToVTK.C

@@ -141,7 +141,7 @@ Note
 #include "pointSet.H"
 #include "HashOps.H"
 #include "regionProperties.H"
-#include "stringListOps.H"
+#include "stringListOps.H"  // For stringListOps::findMatching()
 
 #include "Cloud.H"
 #include "readFields.H"
@@ -780,7 +780,7 @@ int main(int argc, char *argv[])
                 }
             }
 
-            IOobjectList objects(0);
+            IOobjectList objects;
 
             if (doConvertFields)
             {