ENH: expression versions of Function1 and PatchFunction1 (#1709)

applications/test/Function1/Test-Function1.C

...cations/test/Function1/case1/constant/function1Properties

applications/test/Function1/case1/system/controlDict

src/OpenFOAM/Make/files

src/OpenFOAM/expressions/Function1/Function1Expression.C

src/OpenFOAM/expressions/Function1/Function1Expression.H

src/OpenFOAM/expressions/Function1/makeFunction1Expression.C

src/OpenFOAM/expressions/fields/fieldExprDriver.C

src/OpenFOAM/expressions/fields/fieldExprDriver.H

src/finiteVolume/Make/files

...ume/expressions/PatchFunction1/PatchFunction1Expression.C

...ume/expressions/PatchFunction1/PatchFunction1Expression.H

...expressions/PatchFunction1/makePatchFunction1Expression.C