ENH: place more patch field attributes under template invariant Base

- attributes such as assignable(), coupled() etc

- common patchField types: calculatedType(), zeroGradientType() etc.
  This simplifies reference to these types without actually needing a
  typed patchField version.

ENH: add some basic patchField types to fieldTypes namespace

- allows more general use of the names

ENH: set extrapolated/calculated from patchInternalField directly

- avoids intermediate tmp

src/finiteVolume/fields/fvPatchFields/derived/codedFixedValue/codedFixedValueFvPatchField.C

@@ -189,7 +189,7 @@ Foam::codedFixedValueFvPatchField<Type>::codedFixedValueFvPatchField
     if (!this->readValueEntry(dict))
     {
         // Assign dummy value to get redirectPatchField not fail
-        this->operator==(this->patchInternalField());
+        fvPatchField<Type>::patchInternalField(*this);
 
         this->evaluate(Pstream::commsTypes::blocking);
     }