ENH: add construct ConstantField with uniform value

...enFOAM/primitives/functions/Function1/Constant/Constant.C

...enFOAM/primitives/functions/Function1/Constant/Constant.H

...FOAM/primitives/functions/Function1/Function1/Function1.H

...M/primitives/functions/Function1/Function1/Function1New.C

src/meshTools/PatchFunction1/ConstantField/ConstantField.C

src/meshTools/PatchFunction1/ConstantField/ConstantField.H

src/meshTools/PatchFunction1/ConstantField/ConstantFieldI.H

src/meshTools/PatchFunction1/PatchFunction1.C

src/meshTools/PatchFunction1/PatchFunction1.H

src/meshTools/PatchFunction1/PatchFunction1New.C

...ools/PatchFunction1/UniformValueField/UniformValueField.H

...ols/PatchFunction1/UniformValueField/UniformValueFieldI.H