ENH: added timeFunctionObject virtual class in inheritance hierarchy

- simply a functionObject with an additional Time reference, which is
  a combination frequently used by concrete functionObjects

src/OpenFOAM/db/functionObjects/logFiles/logFiles.C

@@ -102,12 +102,6 @@ Foam::functionObjects::logFiles::logFiles
 }
 
 
-// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
-
-Foam::functionObjects::logFiles::~logFiles()
-{}
-
-
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
 const Foam::wordList& Foam::functionObjects::logFiles::names() const

src/OpenFOAM/db/functionObjects/logFiles/logFiles.H

@@ -51,7 +51,7 @@ namespace functionObjects
 {
 
 /*---------------------------------------------------------------------------*\
-                          Class logFiles Declaration
+                  Class functionObjects::logFiles Declaration
 \*---------------------------------------------------------------------------*/
 
 class logFiles
@@ -116,7 +116,7 @@ public:
 
 
     //- Destructor
-    virtual ~logFiles();
+    virtual ~logFiles() = default;
 
 
     // Member Functions