ENH: generalize instant to be templated, movable, etc

- allows reuse for other purposes

applications/test/instant/Make/files

@@ -0,0 +1,3 @@
+Test-instant.C
+
+EXE = $(FOAM_USER_APPBIN)/Test-instant

applications/test/instant/Make/options

@@ -0,0 +1,2 @@
+/* EXE_INC = -I$(LIB_SRC)/cfdTools/include */
+/* EXE_LIBS = -lfiniteVolume */

applications/test/instant/Test-instant.C

@@ -0,0 +1,82 @@
+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | Copyright (C) 2018 OpenCFD Ltd.
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+Description
+    Test instant, fileNameInstant
+
+\*---------------------------------------------------------------------------*/
+
+#include "argList.H"
+#include "instant.H"
+#include "fileNameInstant.H"
+#include "DynamicList.H"
+
+using namespace Foam;
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+// Main program:
+
+int main(int argc, char *argv[])
+{
+    DynamicList<instant> times;
+
+    times.append(instant{});
+    times.append({12, "abc"});
+    times.append(instant{3.14159});
+    times.append({300.456, "def"});
+    times.append({454.456, "xyz"});
+    times.append({10, "ten"});
+
+    {
+        word timeName("twenty");
+
+        Info<<"move append: " << timeName << nl;
+        times.append({20, std::move(timeName)});
+        Info<<"after append: " << timeName << nl;
+    }
+
+    Info<< nl << "times:" << times << nl;
+    sort(times);
+    Info<< "Sorted:" << times << nl;
+
+
+    DynamicList<fileNameInstant> files;
+    files.append(fileNameInstant{});
+    files.append({12, "twelve"});
+    files.append({3.14, "/path/almost-pi"});
+    files.append({300, "/dev/value"});
+    files.append({454, "/tmp/xyz"});
+    files.append({10, "ten"});
+
+    Info<< nl << "files:" << files << nl;
+    sort(files);
+    Info<< "Sorted:" << files << nl;
+
+
+    Info<< "\nEnd\n" << endl;
+
+    return 0;
+}
+
+
+// ************************************************************************* //