objectRegistry, regIOobject: Added support for automatic re-reading of dependent class

Now with the addition of the optional dependenciesModified() function classes
which depend on other classes which are re-read from file when modified are also
automatically updated via their read() function called by
objectRegistry::readModifiedObjects.

This significantly simplifies the update of the solutionControls and modular
solvers when either the controlDict or fvSolution dictionaries are modified at
run-time.

applications/modules/VoFSolver/VoFSolver.C

@@ -197,9 +197,6 @@ Foam::scalar Foam::solvers::VoFSolver::maxDeltaT() const
 
 void Foam::solvers::VoFSolver::preSolve()
 {
-    // Read the controls
-    readControls();
-
     if ((mesh.dynamic() || MRF.size()) && !Uf.valid())
     {
         Info<< "Constructing face momentum Uf" << endl;