ENH: cleanup codeStream - use dynamicCode, dynamicCodeContext encapsulation

Problems remain with codedFixedValueFvPatchScalarField:

- readIfModified() notices change on system/codeDict, but the
  codeProperties::setUnmodified() means that only a single entry will
  get processed

- it appears that while dlclose() may (or may not) be actually closing
  the library, there are probably still references about. This means
  that a subsequent reloading still points to the original functions
  and the lookup is not updated correctly.

src/OpenFOAM/db/dictionary/functionEntries/codeStream/codeStream.H

@@ -135,8 +135,8 @@ public:
         static bool execute
         (
             const dictionary& parentDict,
-            primitiveEntry& entry,
-            Istream& is
+            primitiveEntry&,
+            Istream&
         );
 
 };