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/dynamicFaMesh/interfaceTrackingFvMesh/fvPatchFields/freeSurfaceVelocity/freeSurfaceVelocityFvPatchVectorField.C

@@ -70,7 +70,7 @@ freeSurfaceVelocityFvPatchVectorField
     fixedGradientFvPatchVectorField(p, iF)
 {
     fvPatchFieldBase::readDict(dict);
-    fvPatchVectorField::operator=(patchInternalField());
+    fvPatchField<vector>::patchInternalField(*this);
 }